From my long daily use of KDE on Manjaro, I encountered many weird problems that sometimes I reported as bugs, but some of them cannot be even reproduced by others, the only trick that solved many of them, especially those that appear right after finishing major KDE upgrades, is to create a new user and remove the old one, this creates another annoying problem which is to reconfigure all installed apps including browsers, word processors, compilers, user env vars, custom scripts, desktop layout (panel, widgets, languages, wallpaper, fonts...) and system settings, mail client, chat apps, IDEs settings (Eclipse, VScode...)...
It would be nice to add a feature in KDE Plasma settings where a user can reset an clean whole desktop and user settings related to Plasma like it's newly created account without touching non Plasma apps config, with this re-configuring all installed apps can be avoided ans save user time.

Operating System: Manjaro Linux
KDE Plasma Version: 5.22.4
KDE Frameworks Version: 5.85.0
Qt Version: 5.15.2
Kernel Version: 5.13.11-1-MANJARO (64-bit)
Graphics Platform: X11