Hey,
since upgrading Fedora 43 KDE to 44 KDE, I suddenly have something like an invisible bar at the top of my screen that blocks all mouse access.
It spans the complete width of my screen and is about 30 pixels high.
I just created a bug report for this but as none of my bug reports have ever been fixed I would simultaneously try to tap the crowd knowledge. 
It is present on every desktop, blocks standard window decorations completely, as it blocks most of the tab area in Firefox. It is thus totally annoying. Windows with standard window decorations I can just close using key combinations.
I tried to sketch it using a red rectangle:
Any ideas how to fix this or how to further investigate the problem are really appreciated! 
