Gsettings-desktop-schemas-46.1-2 fails to install

My Manjaro (24.0.6) KDE Plasma started randomly making new sounds, like a notification sound, after the last update. I discovered it was related to a core dump error, which was as follows…

Aug 19 00:14:40 jwbox xdg-desktop-por[1464688]: Settings schema 'org.gnome.system.proxy' is not installed
Aug 19 00:14:40 jwbox kernel: traps: xdg-desktop-por[1464688] trap int3 ip:7f8952bb9b08 sp:7ffc4e0c9870 error:0 in libglib-2.0.so.0.8000.4[7f8952b76000+a4000]
Aug 19 00:14:40 jwbox systemd-coredump[1464694]: Process 1464688 (xdg-desktop-por) of user 1000 terminated abnormally with signal 5/TRAP, processing...
Aug 19 00:14:40 jwbox systemd[1]: Started Process Core Dump (PID 1464694/UID 0).
Aug 19 00:14:40 jwbox systemd-coredump[1464695]: [🡕] Process 1464688 (xdg-desktop-por) of user 1000 dumped core.
                                                  
                                                 Stack trace of thread 1464688:
                                                 #0  0x00007f8952bb9b08 g_log_structured_array (libglib-2.0.so.0 + 0x61b08)
...
Aug 19 00:14:40 jwbox systemd[1649]: xdg-desktop-portal.service: Main process exited, code=dumped, status=5/TRAP
Aug 19 00:14:40 jwbox systemd[1649]: xdg-desktop-portal.service: Failed with result 'core-dump'.
Aug 19 00:14:40 jwbox systemd[1649]: Failed to start Portal service.
Aug 19 00:14:40 jwbox systemd[1]: systemd-coredump@1621-1464694-0.service: Deactivated successfully.

I found a fix in this post → Xdg-desktop portal core-dump

But when I run:
sudo pacman -S gsettings-desktop-schemas

I get:

3/3) Compiling GSettings XML schema files...
/usr/share/glib-2.0/schemas/org.gnome.desktop.a11y.magnifier.gschema.xml:7:1  Error on line 7 char 1: <enum id='org.gnome.desktop.GDesktopMagnifierMouseTrackingMode'> not (yet) defined..  This entire file has bee
n ignored.
/usr/share/glib-2.0/schemas/org.gnome.desktop.a11y.mouse.gschema.xml:15:1  Error on line 15 char 1: <enum id='org.gnome.desktop.GDesktopMouseDwellDirection'> not (yet) defined..  This entire file has been ignored
.
/usr/share/glib-2.0/schemas/org.gnome.desktop.background.gschema.xml:5:1  Error on line 5 char 1: <enum id='org.gnome.desktop.GDesktopBackgroundStyle'> not (yet) defined..  This entire file has been ignored.
/usr/share/glib-2.0/schemas/org.gnome.desktop.interface.gschema.xml:35:1  Error on line 35 char 1: <enum id='org.gnome.desktop.GDesktopToolbarStyle'> not (yet) defined..  This entire file has been ignored.
/usr/share/glib-2.0/schemas/org.gnome.desktop.peripherals.gschema.xml:34:1  Error on line 34 char 1: <enum id='org.gnome.desktop.GDesktopTouchpadTapButtonMap'> not (yet) defined..  This entire file has been ignored.
/usr/share/glib-2.0/schemas/org.gnome.desktop.privacy.gschema.xml:86:1  Error on line 86 char 1: <enum id='org.gnome.desktop.GDesktopUsbProtection'> not (yet) defined..  This entire file has been ignored.
/usr/share/glib-2.0/schemas/org.gnome.desktop.screensaver.gschema.xml:89:1  Error on line 89 char 1: <enum id='org.gnome.desktop.GDesktopBackgroundStyle'> not (yet) defined..  This entire file has been ignored.
/usr/share/glib-2.0/schemas/org.gnome.desktop.wm.preferences.gschema.xml:42:1  Error on line 42 char 1: <enum id='org.gnome.desktop.GDesktopFocusMode'> not (yet) defined..  This entire file has been ignored.

This is the same error I get when I run:

sudo /usr/bin/glib-compile-schemas /usr/share/glib-2.0/schemas/

And also when I run (attempting to purge anything gnome-related):

sudo pacman -R xapp
sudo pacman -R libgnomekbd

I have no idea how to debug this or fix it. Not only does it “bing” every few seconds, but it also appears to freeze my mouse every few seconds.

Is this a necessary package? Or is it left over from gnome stuff that somehow got installed?

Any suggestions as to why this is happening or how to fix it?

Just to get more information, what are the outputs from

head /usr/share/glib-2.0/schemas/org.gnome.desktop.a11y.magnifier.gschema.xml

and

pacman -Qm

Here the output…

head /usr/share/glib-2.0/schemas/org.gnome.desktop.a11y.magnifier.gschema.xml

<?xml version="1.0" encoding="UTF-8"?>
<schemalist gettext-domain="gsettings-desktop-schemas">

  <schema id="org.gnome.desktop.a11y.magnifier"
          path="/org/gnome/desktop/a11y/magnifier/">
    <key name="mouse-tracking" enum="org.gnome.desktop.GDesktopMagnifierMouseTrackingMode">
      <default>'proportional'</default>
      <summary>Mouse Tracking Mode</summary>
      <description>
        Determines the position of the magnified mouse image within the

pacman -Qm
(I have not shown security and financial related packages, but they are not anything exotic)
None of these packages (or those not shown) have been recently installed, only updated, except for kwin6-bismuth-decoration-git r4.603f3cc-1, which was installed after the problem appeared.

auracle-git r395.d36d317-1
auracle-git-debug r379.62fffaa-1
cheetah 0.2.3-1
debtap 3.5.1-1
etcher-bin 1.19.21-1
gkrellm-themes 20030109-1
gkrellmoon 0.6-3
gkrellweather 2.0.8-8
google-chrome 127.0.6533.119-1
joe 4.6-2
kwin6-bismuth-decoration-git r4.603f3cc-1
libpdfium-nojs 6533.r1.6265082af5-1
linux-headers 6.10.2.arch1-1
megasync 5.4.1.0-1
melt-bin 0.6.1-1
mingo 1.12.0-1
mlt-git 7.24.0.r47.29379098-1
mongodb-bin 7.0.12-1
mongosh-bin 2.2.15-1
mongosh-bin-debug 2.2.14-1
mysql2sqlite-git r54.d14d22a-2
ocenaudio-bin 3.14.1-1
oh-my-zsh-git r7336.e83c10e0a-1
openssl-1.0 1.0.2.u-6
openstego 0.8.6-1
pacaur 4.8.6-1
prince-books-bin 20191125-1
rate-mirrors-bin 0.18.0-1
robo3t-bin 1.4.4-1
synergy 1.14.6.19-1
typora 1.9.3-1
virtualbox-ext-oracle 7.0.20-1
virtualbox-host-modules-arch 7.0.20-6
visual-studio-code-bin 1.92.1-1

This has some similarities to another recently resolved thread