Cannot change some of the icons in KDE anymore

I have a few icons I changed from the theme I’m currently using in Plasma, right from the Properties menu. In specific, I chose a different icon for KBibTeX and Android Messages.
Since a couple of days ago, the icons for those two applications reset to their defaults, and I cannot change them anymore.
I cannot find the reason for that.
When I try to change them by right clicking on Application Launcher > Edit Applications > Search…, clicking on the icon, selecting the new icon, and then pressing Save, it seems to work, but the actual icon is not changed in the system.

I realised that, whatever the application, if I add its icon to the Desktop, I cannot change it within its Properties, because I get the error message

Could not save properties due to insufficient write access to: '/home/<myname>/Desktop/org.kde.<app>.desktop'

I already removed the icon cache and rebooted, with no avail:

rm ~/.cache/icon-cache.kcache

Any hint on how to solve this?

Output of `inxi -Fazy`
Kernel: 5.17.1-3-MANJARO arch: x86_64 bits: 64 compiler: gcc v: 11.2.0
parameters: BOOT_IMAGE=/vmlinuz-5.17-x86_64
root=UUID=ca0b13f1-3220-4bc9-9dc7-77d2311111e0 rw rootflags=subvol=@ quiet
apparmor=1 security=apparmor udev.log_priority=3
Desktop: KDE Plasma v: 5.24.4 tk: Qt v: 5.15.3 info: latte-dock
wm: kwin_x11 vt: 1 dm: SDDM Distro: Manjaro Linux base: Arch Linux
Type: Laptop System: LENOVO product: 4180Q3U v: ThinkPad T420
serial: <superuser required> Chassis: type: 10 serial: <superuser required>
Mobo: LENOVO model: 4180Q3U serial: <superuser required>
UEFI-[Legacy]: LENOVO v: 83ET82WW (1.52 ) date: 06/04/2018
ID-1: BAT0 charge: 43.4 Wh (58.7%) condition: 73.9/75.5 Wh (97.9%)
volts: 11.4 min: 11.1 model: SANYO 45N1023 type: Li-ion serial: <filter>
status: not charging
Info: model: Intel Core i7-2640M bits: 64 type: MT MCP arch: Sandy Bridge
family: 6 model-id: 0x2A (42) stepping: 7 microcode: 0x2F
Topology: cpus: 1x cores: 2 tpc: 2 threads: 4 smt: enabled cache:
L1: 128 KiB desc: d-2x32 KiB; i-2x32 KiB L2: 512 KiB desc: 2x256 KiB
L3: 4 MiB desc: 1x4 MiB
Speed (MHz): avg: 1658 high: 2963 min/max: 800/3500 scaling:
driver: intel_cpufreq governor: schedutil cores: 1: 1957 2: 903 3: 810
4: 2963 bogomips: 22337
Flags: avx ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3
Type: itlb_multihit status: KVM: VMX unsupported
Type: l1tf mitigation: PTE Inversion
Type: mds mitigation: Clear CPU buffers; SMT vulnerable
Type: meltdown mitigation: PTI
Type: spec_store_bypass
mitigation: Speculative Store Bypass disabled via prctl
Type: spectre_v1
mitigation: usercopy/swapgs barriers and __user pointer sanitization
Type: spectre_v2 mitigation: Retpolines, IBPB: conditional, IBRS_FW,
STIBP: conditional, RSB filling
Type: srbds status: Not affected
Type: tsx_async_abort status: Not affected
Device-1: Intel 2nd Generation Core Processor Family Integrated Graphics
vendor: Lenovo ThinkPad T420 driver: i915 v: kernel ports:
active: LVDS-1,VGA-1 empty: DP-1, DP-2, DP-3, HDMI-A-1, HDMI-A-2, HDMI-A-3
bus-ID: 00:02.0 chip-ID: 8086:0126 class-ID: 0300
Device-2: Chicony integrated camera type: USB driver: uvcvideo
bus-ID: 1-1.6:5 chip-ID: 04f2:b221 class-ID: 0e02
Display: x11 server: X.Org v: compositor: kwin_x11 driver: X:
loaded: modesetting alternate: fbdev,vesa gpu: i915 display-ID: :0
screens: 1
Screen-1: 0 s-res: 1920x1980 s-dpi: 96 s-size: 506x522mm (19.92x20.55")
s-diag: 727mm (28.62")
Monitor-1: LVDS-1 pos: primary,bottom-r model: LG Display 0x02e2
built: 2010 res: 1600x900 hz: 60 dpi: 131 gamma: 1.2
size: 310x174mm (12.2x6.85") diag: 355mm (14") ratio: 16:9 modes: 1600x900
Monitor-2: VGA-1 pos: primary,top-left model: BenQ GW2780 serial: <filter>
built: 2021 res: 1920x1080 hz: 60 dpi: 82 gamma: 1.2
size: 598x336mm (23.54x13.23") diag: 686mm (27") ratio: 16:9 modes:
max: 1920x1080 min: 720x400
OpenGL: renderer: Mesa DRI Intel HD Graphics 3000 (SNB GT2)
v: 3.3 Mesa 21.3.8 compat-v: 3.0 direct render: Yes
Device-1: Intel 6 Series/C200 Series Family High Definition Audio
vendor: Lenovo driver: snd_hda_intel v: kernel bus-ID: 00:1b.0
chip-ID: 8086:1c20 class-ID: 0403
Sound Server-1: ALSA v: k5.17.1-3-MANJARO running: yes
Sound Server-2: sndio v: N/A running: no
Sound Server-3: JACK v: 1.9.20 running: no
Sound Server-4: PulseAudio v: 15.0 running: yes
Sound Server-5: PipeWire v: 0.3.49 running: yes
Device-1: Intel 82579LM Gigabit Network vendor: Lenovo ThinkPad T520
driver: e1000e v: kernel port: 5080 bus-ID: 00:19.0 chip-ID: 8086:1502
class-ID: 0200
IF: enp0s25 state: up speed: 1000 Mbps duplex: full mac: <filter>
Device-2: Intel Centrino Advanced-N 6205 [Taylor Peak] driver: iwlwifi
v: kernel pcie: gen: 1 speed: 2.5 GT/s lanes: 1 bus-ID: 03:00.0
chip-ID: 8086:0085 class-ID: 0280
IF: wlp3s0 state: up mac: <filter>
IF-ID-1: wwp0s29u1u4i6 state: down mac: <filter>
Device-1: Broadcom BCM2045B (BDC-2.1) type: USB driver: btusb v: 0.8
bus-ID: 1-1.4:4 chip-ID: 0a5c:217f class-ID: fe01 serial: <filter>
Report: rfkill ID: hci0 rfk-id: 3 state: up address: see --recommends
Local Storage: total: 1.36 TiB used: 1003.88 GiB (71.8%)
SMART Message: Unable to run smartctl. Root privileges required.
ID-1: /dev/sda maj-min: 8:0 vendor: Samsung model: SSD 860 EVO 500GB
size: 465.76 GiB block-size: physical: 512 B logical: 512 B speed: 6.0 Gb/s
type: SSD serial: <filter> rev: 3B6Q scheme: MBR
ID-2: /dev/sdb maj-min: 8:16 vendor: HGST (Hitachi) model: HTS541010A9E680
size: 931.51 GiB block-size: physical: 4096 B logical: 512 B speed: 6.0 Gb/s
type: HDD rpm: 5400 serial: <filter> rev: A7G0 scheme: MBR
ID-1: / raw-size: 100 GiB size: 100 GiB (100.00%) used: 28.34 GiB (28.3%)
fs: btrfs dev: /dev/sda2 maj-min: 8:2
ID-2: /boot raw-size: 512 MiB size: 511 MiB (99.80%)
used: 174.9 MiB (34.2%) fs: vfat dev: /dev/sda1 maj-min: 8:1
ID-3: /home raw-size: 365.26 GiB size: 365.26 GiB (100.00%)
used: 250.78 GiB (68.7%) fs: btrfs dev: /dev/sda3 maj-min: 8:3
ID-4: /var/log raw-size: 100 GiB size: 100 GiB (100.00%)
used: 28.34 GiB (28.3%) fs: btrfs dev: /dev/sda2 maj-min: 8:2
Alert: No swap data was found.
System Temperatures: cpu: 54.0 C mobo: N/A
Fan Speeds (RPM): cpu: 3163
Processes: 297 Uptime: 51m wakeups: 1 Memory: 15.41 GiB
used: 3.9 GiB (25.3%) Init: systemd v: 250 tool: systemctl Compilers:
gcc: 11.2.0 clang: 13.0.1 Packages: pacman: 1971 lib: 421 flatpak: 0
Shell: Zsh v: 5.8.1 running-in: yakuake inxi: 3.3.15

missing group rights that prevent writing ? that’s my first impression at this problem.

Thanks for your reply, @Olli.
I thought it could be related to that, and that is why I posted the error message.
However, I do have write access to my Desktop folder, i.e., I can create and delete any file or folder there. It is only when I create a Desktop icon for any APP I get that error message if I try to change its icon. In fact, I don’t know if that is the normal behaviour or not.
Anyway, I need to change the icon on the properties of the application, so it is reflected in the whole system.

For those who might end up here with a similar problem, I found a solution, although perhaps not the most elegant.
After changing the icon of the APP in any of the aforementioned ways, sudo copy the corresponding “.desktop” file located in the .local/share/applications directory to /usr/share/applications/.
For example, in case of KBibTeX:

sudo cp ~/.local/share/applications/org.kde.kbibtex.desktop /usr/share/applications/

I believe the file located at ~/.local/share/applications/ should have precedence over the one located at /usr/share/applications/, but somehow that is not working anymore in my Manjaro KDE, at least for KBibTeX and Android Messages.
In addition, you will probably lose the icon in a future software update, but if the problem persists, you can repeat the process.

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