I’ve just updated KDE Linux from version 06-06-2026 to 06-12-2026 and it refuses to load or create icons and desktop panels but creating widgets is still possible. I also can’t click and drag select anything. I didn’t update Flatpaks or system packages prior to upgrading since I updated manually through the console.
Plasma is currently 6.6.5 which was released on 5-12-26. Unless you’re running the beta you should be on that depending on you distro. Now your distro may have done a major update and with it updated whichever version of Plasma they’re using. In that case it would be the distro that caused whatever issue you are having.