Does the problem also occur on a Plasma Wayland session?
You can change your Plasma session from X11 to Wayland by selecting the session type at the login screen (Wayland is now KDE’s default for Plasma).
If you have set up autologin to skip the password screen, you can change to a Wayland session by opening System Settings → Colors & Themes → Login Screen (SDDM) → Behavior.
If switching from X11 to Wayland doesn’t resolve the issue, then troubleshooting the issue will require more detailed information about your system. Please ensure you read through the pre-prepared instructions below:
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The Update Announcements contain a Known Issues and Solutions section and should generally be checked before posting a request for support.
Output of the inxi command (with appropriate parameters, and formatted according to forum guidelines) will generate information useful for those wishing to help:
inxi --filter --verbosity=8
or the short form (preferred):
inxi -zv8
- inxi man pages (Arch Manual)
Regards.