Created attachment 166611 [details]
example

SUMMARY

When I snap Firefox to the left or right side of the screen, mouse interactions happen at the wrong location.  I have to place the mouse about 30 pixels below the thing I want to click/interact with, clicking on the target does nothing, or clicks the thing 30 pixels above.  Cursor changes based on the incorrect location also.

This happens mainly when I launch Firefox and snap it left or right with Meta+L|R hotkey, also when I drag window to either side.  I can 'fix' this by maximizing the window, then snapping left or right.  That seems to fix the issue until I close and relaunch

STEPS TO REPRODUCE
1. Launch Firefox
2. Snap left or right
3. Move mouse into Firefox window, notice mouse position seems to report incorrectly, cursors change for item 30 pixels above mouse cursor, clicking interacts with that point also

OBSERVED RESULT
Mouse position / interactions happen 30ish pixels above cursor

EXPECTED RESULT
Mouse position is right

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma:  Arch - plasma-meta 6.0-2
(available in About System)
KDE Plasma Version: 6.0.1
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2

ADDITIONAL INFORMATION
This was an upgrade from KDE Plasma 5.X, I tried resetting Firefox profile, renamed plasma-org.kde.plasma.desktop-appletsrc, 100% scaling display, X11.