Got a black screen with mouse cursor only after switching (on SDDM screen) a user session type between X11 and Wayland

In order to get a freshest versions before to report both issues: from the current and from the Ark 7zip and zip compression not working properly and crashing Dolphin - #40 by alven threads, I decide to kill update my Manjaro OS copy to all possibly suspected packages from both issues:
plasma-wayland-session-git baloo-git ark-git dolphin-git (baloo also cause 429910 – Settings -> File search: Folder specific configuration list: self-reproducing, irremovable items of '/home/<username>' with 'indexed' value , with duplicated 7 months later 439403 – Folder specific configuration show multiple home directory rules that cannot be deleted)

$ pamac install plasma-wayland-session-git baloo-git ark-git dolphin-git
Warning: ark-git is only available from AUR
Preparing...
Checking ark-git dependencies...
Synchronizing package databases...
Resolving dependencies...
Checking inter-conflicts...

To install (85):
  ki18n-git                    5.88.0_r504.gc6d6f9d-1       (Required By: baloo-git)                      chaotic-aur  1.3 MB
  karchive-git                 5.88.0_r516.g11877f5-1       (Required By: ark-git)                        chaotic-aur  401.8 kB
  kconfig-git                  5.88.0_r879.g605383b-1       (Required By: dolphin-git)                    chaotic-aur  1.2 MB
  kcoreaddons-git              5.88.0_r1321.gb1c0b041-1     (Required By: dolphin-git)                    chaotic-aur  1.3 MB
  kfilemetadata-git            5.88.0_r818.gdd28fac-1       (Required By: baloo-git)                      chaotic-aur  366.7 kB
  kidletime-git                5.88.0_r322.g75f32f3-1       (Required By: baloo-git)                      chaotic-aur  141.0 kB
  solid-git                    5.88.0_r714.g8395746-1       (Required By: baloo-git)                      chaotic-aur  881.2 kB
  kwidgetsaddons-git           5.88.0_r888.g90f536cc-1      (Required By: baloo-git)                      chaotic-aur  4.4 MB
  kjobwidgets-git              5.86.0_r374.gb87dc09-1       (Required By: baloo-git)                      chaotic-aur  310.2 kB
  kdbusaddons-git              5.88.0_r385.gf143ca2-1       (Required By: baloo-git)                      chaotic-aur  216.9 kB
  kwindowsystem-git            5.88.0_r635.g64908e8-1       (Required By: dolphin-git)                    chaotic-aur  800.1 kB
  kcrash-git                   5.88.0_r418.g882232d-1       (Required By: baloo-git)                      chaotic-aur  123.4 kB
  kglobalaccel-git             5.88.0_r477.g6ac1330-1       (Required By: baloo-git)                      chaotic-aur  249.6 kB
  polkit-qt5-git               v0.114.0.r6.g96ee56a-1       (Required By: baloo-git)                      chaotic-aur  94.7 kB
  kauth-git                    5.86.0_r445.gfb6c512-1       (Required By: baloo-git)                      chaotic-aur  316.2 kB
  kcodecs-git                  5.88.0_r393.g3e33f7d-1       (Required By: baloo-git)                      chaotic-aur  155.3 kB
  kguiaddons-git               5.88.0_r399.g7713ec5-1       (Required By: baloo-git)                      chaotic-aur  310.1 kB
  kconfigwidgets-git           5.86.0_r613.g56185bb-1       (Required By: baloo-git)                      chaotic-aur  881.7 kB
  kitemviews-git               5.88.0_r347.g2cddd86-1       (Required By: baloo-git)                      chaotic-aur  459.1 kB
  kiconthemes-git              5.87.0_r545.g6afc1b8-1       (Required By: baloo-git)                      chaotic-aur  450.6 kB
  attica-git                   5.88.0_r842.gba026a4-1       (Required By: baloo-git)                      chaotic-aur  627.1 kB
  kxmlgui-git                  5.87.0_r811.gbb118bd9-1      (Required By: baloo-git)                      chaotic-aur  1.1 MB
  kbookmarks-git               5.87.0_r423.g2faa427-1       (Required By: baloo-git)                      chaotic-aur  424.8 kB
  knotifications-git           5.88.0_r691.gfdc0fff-1       (Required By: baloo-git)                      chaotic-aur  446.3 kB
  kservice-git                 5.88.0_r956.ge5c14a6-1       (Required By: baloo-git)                      chaotic-aur  712.1 kB
  kwallet-git                  5.87.0_r1092.g09cf911-1      (Required By: baloo-git)                      chaotic-aur  380.0 kB
  kcompletion-git              5.88.0_r466.g1d8d074-1       (Required By: baloo-git)                      chaotic-aur  597.5 kB
  sonnet-git                   5.87.0_r636.gbf84caf-1       (Required By: baloo-git)                      chaotic-aur  648.5 kB
  ktextwidgets-git             5.87.0_r416.ga677b68-1       (Required By: baloo-git)                      chaotic-aur  495.3 kB
  kded-git                     5.88.0_r423.g8d7b6a9-1       (Required By: baloo-git)                      chaotic-aur  44.2 kB
  kio-git                      5.87.0_r5006.g594ea929-1     (Required By: baloo-git)                      chaotic-aur  5.5 MB
  baloo-git                    5.88.0_r3014.ga9af0cc4-1                                                   chaotic-aur  581.7 kB
  knotifyconfig-git            5.88.0_r359.g3415b87-1       (Required By: plasma-wayland-session-git)     chaotic-aur  133.5 kB
  kpackage-git                 5.88.0_r704.g5a70933-1       (Required By: dolphin-git)                    chaotic-aur  274.4 kB
  kdeclarative-git             5.88.0_r932.g9c2702e-1       (Required By: dolphin-git)                    chaotic-aur  507.1 kB
  syndication-git              5.88.0_r846.g7d4c917-1       (Required By: dolphin-git)                    chaotic-aur  1.1 MB
  knewstuff-git                5.88.0_r1228.g6979bf80-1     (Required By: dolphin-git)                    chaotic-aur  1.7 MB
  libksysguard-git             5.23.80_r2313.gb5622a8-1     (Required By: plasma-wayland-session-git)     chaotic-aur  690.7 kB
  kparts-git                   5.87.0_r529.ge1f3201-1       (Required By: dolphin-git)                    chaotic-aur  870.3 kB
  syntax-highlighting-git      5.88.0_r1727.g6de91621-1     (Required By: plasma-wayland-session-git)     chaotic-aur  1.8 MB
  ktexteditor-git              5.87.0_r2946.g855fb066-1     (Required By: plasma-wayland-session-git)     chaotic-aur  2.7 MB
  kpty-git                     5.88.0_r347.g88997f4-1       (Required By: ark-git)                        chaotic-aur  161.2 kB
  kdesu-git                    5.88.0_r480.ge37c3bc-1       (Required By: plasma-wayland-session-git)     chaotic-aur  247.4 kB
  kcmutils-git                 5.87.0_r551.ge83d6bd-1       (Required By: dolphin-git)                    chaotic-aur  413.7 kB
  kactivities-git              5.88.0_r1368.g6fec7a7-1      (Required By: dolphin-git)                    chaotic-aur  321.7 kB
  kde-cli-tools-git            5.23.80_r1873.g5ab245f-1     (Required By: plasma-wayland-session-git)     chaotic-aur  232.8 kB
  phonon-qt5-git               4.11.1_r3850.g6a5106d3-1     (Required By: ark-git)                        chaotic-aur  396.5 kB
  kactivitymanagerd-git        5.23.0_r1373.g242b7cf-1      (Required By: plasma-wayland-session-git)     chaotic-aur  264.6 kB
  kholidays-git                1:5.88.0_r973.gbd84d74-1     (Required By: plasma-wayland-session-git)     chaotic-aur  386.1 kB
  kwayland-git                 5.88.0_r1120.gf97c2e5-1      (Required By: plasma-wayland-session-git)     chaotic-aur  2.7 MB
  kirigami2-git                5.88.0_r2932.g58fd02a7-1     (Required By: plasma-wayland-session-git)     chaotic-aur  628.3 kB
  plasma-framework-git         5.87.0_r15991.ga30874488-1   (Required By: plasma-wayland-session-git)     chaotic-aur  5.3 MB
  threadweaver-git             5.88.0_r517.g1b3b341-1       (Required By: plasma-wayland-session-git)     chaotic-aur  500.3 kB
  krunner-git                  5.88.0_r692.g573c971-1       (Required By: plasma-wayland-session-git)     chaotic-aur  416.2 kB
  kitemmodels-git              5.88.0_r564.gef7b4a1-1       (Required By: plasma-wayland-session-git)     chaotic-aur  665.3 kB
  milou-git                    5.23.80_r754.gfe6e4e3-1      (Required By: plasma-wayland-session-git)     chaotic-aur  78.3 kB
  prison-git                   5.88.0_r339.gc93839a-1       (Required By: plasma-wayland-session-git)     chaotic-aur  185.2 kB
  layer-shell-qt-git           5.23.80_r50.g662afeb-1       (Required By: plasma-wayland-session-git)     chaotic-aur  29.4 kB
  kscreenlocker-git            5.23.80_r883.g69e1385-1      (Required By: plasma-wayland-session-git)     chaotic-aur  198.0 kB
  kwayland-server-git          5.23.80.r1404.g53b453d9-1    (Required By: plasma-wayland-session-git)     chaotic-aur  588.5 kB
  frameworkintegration-git     5.87.0_r599.gf03f0cc-1       (Required By: plasma-wayland-session-git)     chaotic-aur  1.6 MB
  kdecoration-git              5.23.80_r277.g5285f9d-1      (Required By: plasma-wayland-session-git)     chaotic-aur  82.7 kB
  breeze-icons-git             5.88.0_r1814.gd9a5af79-1     (Required By: plasma-wayland-session-git)     chaotic-aur  10.9 MB
  breeze-git                   5.23.80_r2289.g7f9f732a-1    (Required By: plasma-wayland-session-git)     chaotic-aur  81.2 MB
  qt5-script                   5.15.6-1                     (Required By: plasma-wayland-session-git)     extra        995.2 kB
  libqaccessibilityclient-git  v0.4.0.r20.92ca5bb-1         (Required By: plasma-wayland-session-git)     chaotic-aur  166.2 kB
  kwin-git                     5.23.80_r20100.g886a86ab2-1  (Required By: plasma-wayland-session-git)     chaotic-aur  6.5 MB
  qqc2-desktop-style-git       5.88.0_r541.g939176f-1       (Required By: plasma-wayland-session-git)     chaotic-aur  87.0 kB
  plasma-integration-git       5.23.80_r536.gb17aaf9-1      (Required By: plasma-wayland-session-git)     chaotic-aur  180.9 kB
  kunitconversion-git          5.88.0_r383.ge3e3b4b-1       (Required By: plasma-wayland-session-git)     chaotic-aur  281.2 kB
  kemoticons-git               5.88.0_r391.g1fc0725-1       (Required By: plasma-wayland-session-git)     chaotic-aur  2.0 MB
  kdelibs4support-git          5.87.0_r1038.g756e5326-1     (Required By: plasma-wayland-session-git)     chaotic-aur  2.3 MB
  kpeople-git                  5.88.0_r1351.g6d9d32e-1      (Required By: plasma-wayland-session-git)     chaotic-aur  324.8 kB
  kactivities-stats-git        5.88.0_r378.gece9abd-1       (Required By: plasma-wayland-session-git)     chaotic-aur  291.1 kB
  libkscreen-git               5.23.80_r1600.g7eb0390-1     (Required By: plasma-wayland-session-git)     chaotic-aur  434.2 kB
  kquickcharts-git             5.88.0_r486.g9d1ec29-1       (Required By: plasma-wayland-session-git)     chaotic-aur  164.4 kB
  kuserfeedback-git            1.0.0_r728.g5820938-1        (Required By: dolphin-git)                    chaotic-aur  499.8 kB
  plasma-workspace-git         5.23.80_r10746.g01a74949f-1  (Required By: plasma-wayland-session-git)     chaotic-aur  9.1 MB
  kwayland-integration-git     5.23.80_r189.gda7ddbb-1      (Required By: plasma-wayland-session-git)     chaotic-aur  47.4 kB
  plasma-wayland-session-git   5.23.80_r10746.g01a74949f-1                                                chaotic-aur  8.1 kB
  dolphin-git                  21.11.70_r6724.gb497dc9cb-1                                                chaotic-aur  1.4 MB
  kdoctools-git                5.88.0_r633.g7b3b282-1       (Required By: ark-git)                        chaotic-aur  601.6 kB
  kjs-git                      5.88.0_r341.g1daea23-1       (Required By: ark-git)                        chaotic-aur  493.0 kB
  khtml-git                    5.88.0_r562.ge5a450c-1       (Required By: ark-git)                        chaotic-aur  3.1 MB
  extra-cmake-modules-git      5.87.0_r3368.gdc86450-1      (Required By: ark-git)                        chaotic-aur  623.9 kB
To build (1):
  ark-git                      r3038.f42c580-1                                                            AUR
To remove (85):
  ark                          21.08.2-1                    (Conflicts With: ark-git)                     extra
  extra-cmake-modules          5.87.0-1                     (Conflicts With: extra-cmake-modules-git)     extra
  khtml                        5.87.0-1                     (Conflicts With: khtml-git)                   extra
  kjs                          5.87.0-1                     (Conflicts With: kjs-git)                     extra
  kdoctools                    5.87.0-1                     (Conflicts With: kdoctools-git)               extra
  dolphin                      21.08.2-1                    (Conflicts With: dolphin-git)                 extra
  kdelibs4support              5.87.0-1                     (Conflicts With: kdelibs4support-git)         extra
  kemoticons                   5.87.0-1                     (Conflicts With: kemoticons-git)              extra
  kunitconversion              5.87.0-1                     (Conflicts With: kunitconversion-git)         extra
  plasma-wayland-session       5.23.1-1                     (Conflicts With: plasma-wayland-session-git)  extra
  kwayland-integration         5.23.1-1                     (Conflicts With: kwayland-integration-git)    extra
  plasma-workspace             5.23.1-1                     (Conflicts With: plasma-workspace-git)        extra
  libksysguard                 5.23.1-1                     (Conflicts With: libksysguard-git)            extra
  phonon-qt5                   4.11.1-2                     (Conflicts With: phonon-qt5-git)              extra
  kuserfeedback                1.0.0-1                      (Conflicts With: kuserfeedback-git)           extra
  kquickcharts                 5.87.0-1                     (Conflicts With: kquickcharts-git)            extra
  libkscreen                   5.23.1-1                     (Conflicts With: libkscreen-git)              extra
  kactivities-stats            5.87.0-1                     (Conflicts With: kactivities-stats-git)       extra
  kpeople                      5.87.0-1                     (Conflicts With: kpeople-git)                 extra
  plasma-integration           5.23.1-1                     (Conflicts With: plasma-integration-git)      extra
  qqc2-desktop-style           5.87.0-1                     (Conflicts With: qqc2-desktop-style-git)      extra
  kwin                         5.23.1-1                     (Conflicts With: kwin-git)                    extra
  libqaccessibilityclient      0.4.1-2                      (Conflicts With: libkdeaccessibilityclient)   extra
  breeze                       5.23.1-1                     (Conflicts With: breeze-git)                  extra
  breeze-icons                 5.87.0-1                     (Conflicts With: breeze-icons-git)            extra
  kdecoration                  5.23.1-1                     (Conflicts With: kdecoration-git)             extra
  frameworkintegration         5.87.0-1                     (Conflicts With: frameworkintegration-git)    extra
  knewstuff                    5.87.0-1                     (Conflicts With: knewstuff-git)               extra
  syndication                  5.87.0-1                     (Conflicts With: kde-syndication)             extra
  kwayland-server              5.23.1-1                     (Conflicts With: kwayland-server-git)         extra
  kscreenlocker                5.23.1-1                     (Conflicts With: kscreenlocker-git)           extra
  layer-shell-qt               5.23.1-1                     (Conflicts With: layer-shell-qt-git)          extra
  prison                       5.87.0-1                     (Conflicts With: prison-git)                  extra
  milou                        5.23.1-1                     (Conflicts With: milou-git)                   extra
  kitemmodels                  5.87.0-1                     (Conflicts With: kitemmodels-git)             extra
  krunner                      5.87.0-1                     (Conflicts With: krunner-git)                 extra
  threadweaver                 5.87.0-1                     (Conflicts With: threadweaver-git)            extra
  plasma-framework             5.87.0-1                     (Conflicts With: plasma-framework-git)        extra
  kirigami2                    5.87.0-1                     (Conflicts With: kirigami2-git)               extra
  kwayland                     5.87.0-1                     (Conflicts With: kwayland-git)                extra
  kholidays                    1:5.87.0-1                   (Conflicts With: kholidays-git)               extra
  kactivitymanagerd            5.23.1-1                     (Conflicts With: kactivitymanagerd-git)       extra
  kde-cli-tools                5.23.1-1                     (Conflicts With: kde-cli-tools-git)           extra
  kactivities                  5.87.0-1                     (Conflicts With: kactivities-git)             extra
  kcmutils                     5.87.0-1                     (Conflicts With: kcmutils-git)                extra
  kdeclarative                 5.87.0-1                     (Conflicts With: kdeclarative-git)            extra
  kpackage                     5.87.0-1                     (Conflicts With: kpackage-git)                extra
  kdesu                        5.87.0-1                     (Conflicts With: kdesu-git)                   extra
  kpty                         5.87.0-1                     (Conflicts With: kpty-git)                    extra
  ktexteditor                  5.87.0-1                     (Conflicts With: ktexteditor-git)             extra
  syntax-highlighting          5.87.0-2                     (Conflicts With: syntax-highlighting-git)     extra
  kparts                       5.87.0-1                     (Conflicts With: kparts-git)                  extra
  knotifyconfig                5.87.0-1                     (Conflicts With: knotifyconfig-git)           extra
  attica                       5.87.0-1                     (Conflicts With: attica-git)                  extra
  baloo                        5.87.0-1                     (Conflicts With: baloo-git)                   extra
  kio                          5.87.0-1                     (Conflicts With: kio-git)                     extra
  kded                         5.87.0-1                     (Conflicts With: kded-git)                    extra
  ktextwidgets                 5.87.0-1                     (Conflicts With: ktextwidgets-git)            extra
  sonnet                       5.87.0-1                     (Conflicts With: sonnet-git)                  extra
  kcompletion                  5.87.0-1                     (Conflicts With: kcompletion-git)             extra
  kwallet                      5.87.0-1                     (Conflicts With: kwallet-git)                 extra
  kservice                     5.87.0-1                     (Conflicts With: kservice-git)                extra
  knotifications               5.87.0-1                     (Conflicts With: knotifications-git)          extra
  kbookmarks                   5.87.0-1                     (Conflicts With: kbookmarks-git)              extra
  kxmlgui                      5.87.0-1                     (Conflicts With: kxmlgui-git)                 extra
  kiconthemes                  5.87.0-1                     (Conflicts With: kiconthemes-git)             extra
  kitemviews                   5.87.0-1                     (Conflicts With: kitemviews-git)              extra
  kconfigwidgets               5.87.0-1                     (Conflicts With: kconfigwidgets-git)          extra
  kguiaddons                   5.87.0-1                     (Conflicts With: kguiaddons-git)              extra
  kcodecs                      5.87.0-1                     (Conflicts With: kcodecs-git)                 extra
  kauth                        5.87.0-1                     (Conflicts With: kauth-git)                   extra
  polkit-qt5                   0.114.0-1                    (Conflicts With: polkit-qt5-git)              extra
  kglobalaccel                 5.87.0-1                     (Conflicts With: kglobalaccel-git)            extra
  kcrash                       5.87.0-1                     (Conflicts With: kcrash-git)                  extra
  kwindowsystem                5.87.0-1                     (Conflicts With: kwindowsystem-git)           extra
  kdbusaddons                  5.87.0-1                     (Conflicts With: kdbusaddons-git)             extra
  kjobwidgets                  5.87.0-1                     (Conflicts With: kjobwidgets-git)             extra
  kwidgetsaddons               5.87.0-1                     (Conflicts With: kwidgetsaddons-git)          extra
  solid                        5.87.0-1                     (Conflicts With: solid-git)                   extra
  kidletime                    5.87.0-1                     (Conflicts With: kidletime-git)               extra
  kfilemetadata                5.87.0-1                     (Conflicts With: kfilemetadata-git)           extra
  kcoreaddons                  5.87.0-1                     (Conflicts With: kcoreaddons-git)             extra
  kconfig                      5.87.0-1                     (Conflicts With: kconfig-git)                 extra
  karchive                     5.87.0-1                     (Conflicts With: karchive-git)                extra
  ki18n                        5.87.0-1                     (Conflicts With: ki18n-git)                   extra

Total download size: 172.7 MB
Total installed size: 352.8 MB
Total removed size: 508.4 MB

Edit build files : [e] 
Apply transaction ? [e/y/N] 

Guys, if I will not submit you two bug report links in the next 24 hours, then I died got a mess reverting package versions back or reinstalling OS copy. BTW, need to update my image list just in case.

You know, I was loving you all!
OK. Now or never!


EDIT
Oh man… ark-git failed.

...
Installing dolphin-git (21.11.70_r6724.gb497dc9cb-1)...                                                                                                                               [85/85]
Running post-transaction hooks...
Arming ConditionNeedsUpdate...                                                                                                                                                          [1/6]
Refreshing PackageKit...                                                                                                                                                                [2/6]
Reloading system bus configuration...                                                                                                                                                   [3/6]
Updating icon theme caches...                                                                                                                                                           [4/6]
Updating the desktop file MIME type cache...                                                                                                                                            [5/6]
Updating the MIME type database...                                                                                                                                                      [6/6]
A restart is required for the changes to take effect.
Cloning ark-git build files...
Generating ark-git information...

Building ark-git...
==> Making package: ark-git r3038.f42c580-1 (Sun 24 Oct 2021 04:06:08 EEST)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving sources...
  -> Cloning ark git repo...
Cloning into bare repository '/var/tmp/pamac-build-m/ark-git/ark'...
fatal: remote error: Please use the https: protocol to connect to anongit
==> ERROR: Failure while downloading ark git repo
    Aborting...
Error: Failed to build ark-git

$ pamac install plasma-wayland-session-git baloo-git ark-git dolphin-git
Warning: ark-git is only available from AUR
Preparing...
Cloning ark-git build files...
Generating ark-git information...
Checking ark-git dependencies...
Warning: baloo-git-5.88.0_r3014.ga9af0cc4-1 is up to date -- skipping
Warning: plasma-wayland-session-git-5.23.80_r10746.g01a74949f-1 is up to date -- skipping
Warning: dolphin-git-21.11.70_r6724.gb497dc9cb-1 is up to date -- skipping
Resolving dependencies...
Checking inter-conflicts...

To build (1):
  ark-git  r3038.f42c580-1                             AUR
To remove (1):
  ark      21.08.2-1        (Conflicts With: ark-git)  extra

Total removed size: 4.6 MB

Edit build files : [e] 
Apply transaction ? [e/y/N] y


Building ark-git...
==> Making package: ark-git r3038.f42c580-1 (Sun 24 Oct 2021 04:06:34 EEST)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving sources...
  -> Cloning ark git repo...
Cloning into bare repository '/var/tmp/pamac-build-m/ark-git/ark'...
fatal: remote error: Please use the https: protocol to connect to anongit
==> ERROR: Failure while downloading ark git repo
    Aborting...
Error: Failed to build ark-git
$

OMG, not rebooted yet, but the It has begun:
image

image


EDIT2
Oops, seems to be the ark-git maintenance in AUR was dropped: AUR (en) - ark-git
But there is not any other ark-git in Manjaro repos, chaotic-aur and AUR.
OK, so ark remains

$ pacman -Qi ark | grep -iE "ver|install date"
Version         : 21.08.2-1
                  unarchiver: RAR format support [installed]
Install Date    : Thu 07 Oct 2021 18:52:04 EEST
$

EDIT3
That was a bad luck: I was unable to enter both wayland and x11 user session types.
Tried 2 times of each session type: I went no more than a black screen and fully SDDM screen back in a 4-5 seconds after password entering and whole SDDM GUI hang if to try to enter into x11 session.
I finished that experiment by swithing into tty3 and installing all non-git packages version which I had before:

pacman -S dolphin extra-cmake-modules baloo kfilemetadata khtml kjs kdoctools kdelibs4support kemoticons kunitconversion plasma-wayland-session kwayland-integration plasma-workspace libksysguard phonon-qt5 kuserfeedback kquickcharts libkscreen kactivities-stats kpeople plasma-integration qqc2-desktop-style kwin libqaccessibilityclient breeze breeze-icons kdecoration frameworkintegration knewstuff syndication kwayland-server kscreenlocker layer-shell-qt kidletime prison milou kitemmodels krunner threadweaver plasma-framework kirigami2 kwayland kholidays kactivitymanagerd kde-cli-tools kactivities kcmutils kdeclarative kpackage kdesu kpty ktexteditor syntax-highlighting kparts knotifyconfig kio kded kwallet kservice knotifications kjobwidgets solid ktextwidgets sonnet kcompletion attica kbookmarks kxmlgui kiconthemes karchive kitemviews kconfigwidgets kwidgetsaddons ki18n kguiaddons kcodecs kauth polkit-qt5 kglobalaccel kcrash kwindowsystem kcoreaddons kconfig kdbusaddons

EDIT4
Forgot to note: there was no any journalctl -p3 level event: no crashes, errors. The severest was of -p4 level only:

details
[   20.884078] kernel: kauditd_printk_skb: 99 callbacks suppressed
[   21.220043] sddm-greeter[767]: QFont::fromString: Invalid description '(empty)'
[   21.581440] sddm-greeter[767]: QObject: Cannot create children for a parent that is in a different thread.
                                  (Parent is QGuiApplication(0x7ffc3210b4a0), parent's thread is QThread(0x55eefed59ee0), current thread is QThread(0x55eefee74f50)
[   21.582070] sddm-greeter[767]: QObject: Cannot create children for a parent that is in a different thread.
                                  (Parent is QGuiApplication(0x7ffc3210b4a0), parent's thread is QThread(0x55eefed59ee0), current thread is QThread(0x55eefee74f50)
[   21.584194] sddm-greeter[767]: QObject: Cannot create children for a parent that is in a different thread.
                                  (Parent is QGuiApplication(0x7ffc3210b4a0), parent's thread is QThread(0x55eefed59ee0), current thread is QThread(0x55eefee74f50)
[   21.584330] sddm-greeter[767]: QObject::installEventFilter(): Cannot filter events for objects in a different thread.
[   22.147361] sddm-greeter[767]: <input>:406:376: Could not add child element to parent element because the types are incorrect.
[   22.147719] sddm-greeter[767]: <input>:407:130: Could not add child element to parent element because the types are incorrect.
[   22.147776] sddm-greeter[767]: <input>:408:130: Could not add child element to parent element because the types are incorrect.
[   22.147843] sddm-greeter[767]: <input>:408:393: Could not add child element to parent element because the types are incorrect.
[   22.147904] sddm-greeter[767]: <input>:409:130: Could not add child element to parent element because the types are incorrect.
[   22.147959] sddm-greeter[767]: <input>:410:129: Could not add child element to parent element because the types are incorrect.
[   22.148020] sddm-greeter[767]: <input>:411:129: Could not add child element to parent element because the types are incorrect.
[   22.148083] sddm-greeter[767]: <input>:412:129: Could not add child element to parent element because the types are incorrect.
[   22.148136] sddm-greeter[767]: <input>:413:129: Could not add child element to parent element because the types are incorrect.
[   22.148191] sddm-greeter[767]: <input>:413:379: Could not add child element to parent element because the types are incorrect.
[   22.148249] sddm-greeter[767]: <input>:413:631: Could not add child element to parent element because the types are incorrect.
[   22.427953] sddm-greeter[767]: file:///usr/share/sddm/themes/breeze/components/VirtualKeyboard.qml:11:1: Type InputPanel unavailable
[   22.428122] sddm-greeter[767]: qrc:/QtQuick/VirtualKeyboard/content/InputPanel.qml:127:5: Type Keyboard unavailable
[   22.428204] sddm-greeter[767]: qrc:/QtQuick/VirtualKeyboard/content/components/Keyboard.qml:38:1: module "QtQuick.VirtualKeyboard.Plugins" is not installed
[   22.461077] sddm-greeter[767]: libpng warning: iCCP: known incorrect sRGB profile
[   23.331499] sddm-greeter[767]: QDBusConnection: name 'org.freedesktop.UDisks2' had owner '' but we thought it was ':1.15'
[   28.005576] upowerd[782]: treating change event as add on /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5:1.2/0003:046D:C52B.0004/0003:046D:4055.0006/power_supply/hidpp_battery_0
[   28.010391] kernel: kauditd_printk_skb: 12 callbacks suppressed
[   35.035620] upowerd[782]: treating change event as add on /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5:1.2/0003:046D:C52B.0004/0003:046D:4004.0005/power_supply/hidpp_battery_1
[   37.940376] systemd-xdg-autostart-generator[809]: Not generating service for XDG autostart app-watch.sh@autostart.service, error parsing Exec= line: No such file or directory
[   41.523429] sddm-greeter[847]: QFont::fromString: Invalid description '(empty)'
[   41.720033] sddm-greeter[847]: QObject: Cannot create children for a parent that is in a different thread.
                                  (Parent is QGuiApplication(0x7ffe591ada50), parent's thread is QThread(0x556a2bd8fee0), current thread is QThread(0x556a2beaaae0)
[   41.720204] sddm-greeter[847]: QObject: Cannot create children for a parent that is in a different thread.
                                  (Parent is QGuiApplication(0x7ffe591ada50), parent's thread is QThread(0x556a2bd8fee0), current thread is QThread(0x556a2beaaae0)
[   41.720954] sddm-greeter[847]: QObject: Cannot create children for a parent that is in a different thread.
                                  (Parent is QGuiApplication(0x7ffe591ada50), parent's thread is QThread(0x556a2bd8fee0), current thread is QThread(0x556a2beaaae0)
[   41.721061] sddm-greeter[847]: QObject::installEventFilter(): Cannot filter events for objects in a different thread.
[   42.056241] sddm-greeter[847]: file:///usr/share/sddm/themes/breeze/components/VirtualKeyboard.qml:11:1: Type InputPanel unavailable
[   42.056427] sddm-greeter[847]: qrc:/QtQuick/VirtualKeyboard/content/InputPanel.qml:127:5: Type Keyboard unavailable
[   42.056501] sddm-greeter[847]: qrc:/QtQuick/VirtualKeyboard/content/components/Keyboard.qml:38:1: module "QtQuick.VirtualKeyboard.Plugins" is not installed
[   42.080239] sddm-greeter[847]: libpng warning: iCCP: known incorrect sRGB profile
[   47.646427] kernel: kauditd_printk_skb: 21 callbacks suppressed
[  156.962273] sddm-greeter[936]: QFont::fromString: Invalid description '(empty)'
[  157.157281] sddm-greeter[936]: QObject: Cannot create children for a parent that is in a different thread.
                                  (Parent is QGuiApplication(0x7ffd7aa3cb70), parent's thread is QThread(0x55a530f06ee0), current thread is QThread(0x55a531021950)
[  157.157450] sddm-greeter[936]: QObject: Cannot create children for a parent that is in a different thread.
                                  (Parent is QGuiApplication(0x7ffd7aa3cb70), parent's thread is QThread(0x55a530f06ee0), current thread is QThread(0x55a531021950)
[  157.158199] sddm-greeter[936]: QObject: Cannot create children for a parent that is in a different thread.
                                  (Parent is QGuiApplication(0x7ffd7aa3cb70), parent's thread is QThread(0x55a530f06ee0), current thread is QThread(0x55a531021950)
[  157.158305] sddm-greeter[936]: QObject::installEventFilter(): Cannot filter events for objects in a different thread.
[  157.492807] sddm-greeter[936]: file:///usr/share/sddm/themes/breeze/components/VirtualKeyboard.qml:11:1: Type InputPanel unavailable
[  157.492996] sddm-greeter[936]: qrc:/QtQuick/VirtualKeyboard/content/InputPanel.qml:127:5: Type Keyboard unavailable
[  157.493072] sddm-greeter[936]: qrc:/QtQuick/VirtualKeyboard/content/components/Keyboard.qml:38:1: module "QtQuick.VirtualKeyboard.Plugins" is not installed
[  157.516938] sddm-greeter[936]: libpng warning: iCCP: known incorrect sRGB profile
[  168.080465] kernel: kauditd_printk_skb: 9 callbacks suppressed
[  255.444964] systemd-xdg-autostart-generator[998]: Not generating service for XDG autostart app-watch.sh@autostart.service, error parsing Exec= line: No such file or directory
[  255.850362] kcminit_startup[1003]: QDBusConnection: error: could not send signal to service "" path "//home/m/.kde4/share/config/kdeglobals" interface "org.kde.kconfig.notify" member "ConfigChanged": Invalid object path: //home/m/.kde4/share/config/kdeglobals
[  256.794773] kded5[1012]: QDBusConnection: name 'org.kde.kglobalaccel' had owner '' but we thought it was ':1.11'
[  257.248015] kded5[1012]: kscreen.kded: PowerDevil SuspendSession action not available!
[  375.651936] startplasma-x11[981]: QProcess: Destroyed while process ("/usr/bin/plasma_session") is still running.
[  375.668708] sddm[534]: Auth: sddm-helper exited with 1
[  567.695590] kded5[1012]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  567.705112] kded5[1012]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  567.705285] kded5[1012]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  567.706108] kded5[1012]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  567.706210] sddm[534]: Signal received: SIGTERM
[  567.706535] kded5[1012]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  567.709441] kglobalaccel5[1041]: The X11 connection broke (error 1). Did the X11 server die?
[  567.709945] kscreen_backend_launcher[1049]: The X11 connection broke (error 1). Did the X11 server die?
[  567.718780] kded5[1012]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  567.719486] kded5[1012]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  567.719855] kded5[1012]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  567.720269] kded5[1012]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  567.720370] kded5[1012]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  567.720497] kded5[1012]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  567.722373] kded5[1012]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  567.722654] kded5[1012]: The X11 connection broke: I/O error (code 1)
[  567.770406] systemd[804]: obex.service: Failed with result 'exit-code'.
[   20.793317] kernel: kauditd_printk_skb: 96 callbacks suppressed
[   21.127838] sddm-greeter[765]: QFont::fromString: Invalid description '(empty)'
[   21.531125] sddm-greeter[765]: QObject: Cannot create children for a parent that is in a different thread.
                                  (Parent is QGuiApplication(0x7ffd09e0c570), parent's thread is QThread(0x556b47d92ee0), current thread is QThread(0x556b47eade60)
[   21.531673] sddm-greeter[765]: QObject: Cannot create children for a parent that is in a different thread.
                                  (Parent is QGuiApplication(0x7ffd09e0c570), parent's thread is QThread(0x556b47d92ee0), current thread is QThread(0x556b47eade60)
[   21.533781] sddm-greeter[765]: QObject: Cannot create children for a parent that is in a different thread.
                                  (Parent is QGuiApplication(0x7ffd09e0c570), parent's thread is QThread(0x556b47d92ee0), current thread is QThread(0x556b47eade60)
[   21.533925] sddm-greeter[765]: QObject::installEventFilter(): Cannot filter events for objects in a different thread.
[   22.260837] sddm-greeter[765]: file:///usr/share/sddm/themes/breeze/components/VirtualKeyboard.qml:11:1: Type InputPanel unavailable
[   22.261206] sddm-greeter[765]: qrc:/QtQuick/VirtualKeyboard/content/InputPanel.qml:127:5: Type Keyboard unavailable
[   22.261273] sddm-greeter[765]: qrc:/QtQuick/VirtualKeyboard/content/components/Keyboard.qml:38:1: module "QtQuick.VirtualKeyboard.Plugins" is not installed
[   22.288000] sddm-greeter[765]: libpng warning: iCCP: known incorrect sRGB profile
[   23.129702] sddm-greeter[765]: QDBusConnection: name 'org.freedesktop.UDisks2' had owner '' but we thought it was ':1.15'
[   27.721865] upowerd[780]: treating change event as add on /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5:1.2/0003:046D:C52B.0004/0003:046D:4055.0006/power_supply/hidpp_battery_0
[   28.011445] kernel: kauditd_printk_skb: 12 callbacks suppressed
[   32.282340] upowerd[780]: treating change event as add on /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5:1.2/0003:046D:C52B.0004/0003:046D:4004.0005/power_supply/hidpp_battery_1
[   40.411239] systemd-xdg-autostart-generator[806]: Not generating service for XDG autostart app-watch.sh@autostart.service, error parsing Exec= line: No such file or directory
[   41.135735] kcminit_startup[832]: QDBusConnection: error: could not send signal to service "" path "//home/m/.kde4/share/config/kdeglobals" interface "org.kde.kconfig.notify" member "ConfigChanged": Invalid object path: //home/m/.kde4/share/config/kdeglobals
[   42.186585] kded5[841]: QDBusConnection: name 'org.kde.kglobalaccel' had owner '' but we thought it was ':1.9'
[   42.681285] kded5[841]: kscreen.kded: PowerDevil SuspendSession action not available!
[   47.704304] kernel: kauditd_printk_skb: 11 callbacks suppressed
[  160.916597] startplasma-x11[813]: QProcess: Destroyed while process ("/usr/bin/plasma_session") is still running.
[  160.934273] sddm[525]: Auth: sddm-helper exited with 1
[  259.595758] kded5[841]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  259.596104] kded5[841]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  259.596304] kded5[841]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  259.596913] kded5[841]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  259.601197] kded5[841]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  259.602386] kded5[841]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  259.602476] kded5[841]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  259.602702] kded5[841]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  259.610317] sddm[525]: Signal received: SIGTERM
[  259.611243] kglobalaccel5[870]: The X11 connection broke (error 1). Did the X11 server die?
[  259.611444] kscreen_backend_launcher[878]: The X11 connection broke (error 1). Did the X11 server die?
[  259.612210] systemd[801]: plasma-kglobalaccel.service: Failed with result 'exit-code'.
[  259.615948] kded5[841]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  259.616426] kded5[841]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  259.616650] kded5[841]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  259.616819] kded5[841]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  259.616970] kded5[841]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  259.617116] kded5[841]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  259.617183] kded5[841]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  259.617258] kded5[841]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  259.617321] kded5[841]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  259.617391] kded5[841]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  259.617453] kded5[841]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  259.617516] kded5[841]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  259.617589] kded5[841]: QDBusAbstractAdaptor: Cannot relay signal KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
[  259.649968] kded5[841]: The X11 connection broke: I/O error (code 1)
[  259.678628] systemd[801]: obex.service: Failed with result 'exit-code'.
[  264.778186] systemd[1]: opensnitchd.service: Failed with result 'exit-code'.
[  264.784906] kernel: kauditd_printk_skb: 30 callbacks suppressed
[   20.738366] kernel: kauditd_printk_skb: 98 callbacks suppressed
[   21.132177] sddm-greeter[755]: QFont::fromString: Invalid description '(empty)'
[   21.505520] sddm-greeter[755]: QObject: Cannot create children for a parent that is in a different thread.
                                  (Parent is QGuiApplication(0x7ffd963ef430), parent's thread is QThread(0x557db21dfee0), current thread is QThread(0x557db22fa570)
[   21.506077] sddm-greeter[755]: QObject: Cannot create children for a parent that is in a different thread.
                                  (Parent is QGuiApplication(0x7ffd963ef430), parent's thread is QThread(0x557db21dfee0), current thread is QThread(0x557db22fa570)
[   21.508785] sddm-greeter[755]: QObject: Cannot create children for a parent that is in a different thread.
                                  (Parent is QGuiApplication(0x7ffd963ef430), parent's thread is QThread(0x557db21dfee0), current thread is QThread(0x557db22fa570)
[   21.508962] sddm-greeter[755]: QObject::installEventFilter(): Cannot filter events for objects in a different thread.
[   22.245421] sddm-greeter[755]: file:///usr/share/sddm/themes/breeze/components/VirtualKeyboard.qml:11:1: Type InputPanel unavailable
[   22.245817] sddm-greeter[755]: qrc:/QtQuick/VirtualKeyboard/content/InputPanel.qml:127:5: Type Keyboard unavailable
[   22.245878] sddm-greeter[755]: qrc:/QtQuick/VirtualKeyboard/content/components/Keyboard.qml:38:1: module "QtQuick.VirtualKeyboard.Plugins" is not installed
[   22.272171] sddm-greeter[755]: libpng warning: iCCP: known incorrect sRGB profile
[   23.112812] sddm-greeter[755]: QDBusConnection: name 'org.freedesktop.UDisks2' had owner '' but we thought it was ':1.15'
[   25.519293] upowerd[770]: treating change event as add on /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5:1.2/0003:046D:C52B.0004/0003:046D:4055.0006/power_supply/hidpp_battery_0
[   28.011645] kernel: kauditd_printk_skb: 12 callbacks suppressed
[   31.213988] upowerd[770]: treating change event as add on /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5:1.2/0003:046D:C52B.0004/0003:046D:4004.0005/power_supply/hidpp_battery_1
[   32.544871] systemd-xdg-autostart-generator[795]: Not generating service for XDG autostart app-watch.sh@autostart.service, error parsing Exec= line: No such file or directory
[   33.058407] kernel: kauditd_printk_skb: 12 callbacks suppressed
[   35.973862] sddm-greeter[833]: QFont::fromString: Invalid description '(empty)'
[   36.169750] sddm-greeter[833]: QObject: Cannot create children for a parent that is in a different thread.
                                  (Parent is QGuiApplication(0x7ffe5220b900), parent's thread is QThread(0x55efed1eeee0), current thread is QThread(0x55efed309aa0)
[   36.169922] sddm-greeter[833]: QObject: Cannot create children for a parent that is in a different thread.
                                  (Parent is QGuiApplication(0x7ffe5220b900), parent's thread is QThread(0x55efed1eeee0), current thread is QThread(0x55efed309aa0)
[   36.170687] sddm-greeter[833]: QObject: Cannot create children for a parent that is in a different thread.
                                  (Parent is QGuiApplication(0x7ffe5220b900), parent's thread is QThread(0x55efed1eeee0), current thread is QThread(0x55efed309aa0)
[   36.170805] sddm-greeter[833]: QObject::installEventFilter(): Cannot filter events for objects in a different thread.
[   36.504426] sddm-greeter[833]: file:///usr/share/sddm/themes/breeze/components/VirtualKeyboard.qml:11:1: Type InputPanel unavailable
[   36.504614] sddm-greeter[833]: qrc:/QtQuick/VirtualKeyboard/content/InputPanel.qml:127:5: Type Keyboard unavailable
[   36.504686] sddm-greeter[833]: qrc:/QtQuick/VirtualKeyboard/content/components/Keyboard.qml:38:1: module "QtQuick.VirtualKeyboard.Plugins" is not installed
[   36.528700] sddm-greeter[833]: libpng warning: iCCP: known incorrect sRGB profile
[   45.403926] sddm-greeter[879]: QFont::fromString: Invalid description '(empty)'
[   45.600763] sddm-greeter[879]: QObject: Cannot create children for a parent that is in a different thread.
                                  (Parent is QGuiApplication(0x7fff3c850260), parent's thread is QThread(0x55628cfacee0), current thread is QThread(0x55628d0c7a50)
[   45.600952] sddm-greeter[879]: QObject: Cannot create children for a parent that is in a different thread.
                                  (Parent is QGuiApplication(0x7fff3c850260), parent's thread is QThread(0x55628cfacee0), current thread is QThread(0x55628d0c7a50)
[   45.601687] sddm-greeter[879]: QObject: Cannot create children for a parent that is in a different thread.
                                  (Parent is QGuiApplication(0x7fff3c850260), parent's thread is QThread(0x55628cfacee0), current thread is QThread(0x55628d0c7a50)
[   45.601796] sddm-greeter[879]: QObject::installEventFilter(): Cannot filter events for objects in a different thread.
[   45.938580] sddm-greeter[879]: file:///usr/share/sddm/themes/breeze/components/VirtualKeyboard.qml:11:1: Type InputPanel unavailable
[   45.938760] sddm-greeter[879]: qrc:/QtQuick/VirtualKeyboard/content/InputPanel.qml:127:5: Type Keyboard unavailable
[   45.938842] sddm-greeter[879]: qrc:/QtQuick/VirtualKeyboard/content/components/Keyboard.qml:38:1: module "QtQuick.VirtualKeyboard.Plugins" is not installed
[   45.963504] sddm-greeter[879]: libpng warning: iCCP: known incorrect sRGB profile
[   47.797868] kernel: kauditd_printk_skb: 5 callbacks suppressed
[  105.483515] sddm[562]: Error from greeter session: "Process crashed"
[  105.484125] sddm[562]: Auth: sddm-helper crashed (exit code 15)
[  105.484509] sddm[562]: Error from greeter session: "Process crashed"
[  105.484609] sddm[562]: Auth: sddm-helper exited with 15
[  105.493828] sddm[562]: Signal received: SIGTERM

So no a crash dump/call stack to trace, it is probably heavier to investigate such cases comparing to crashes.