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SUMMARY


STEPS TO REPRODUCE
1. Start a game (so far tried various native and proton/wine titles on Steam) in fullscreen
2. Go to meet.google.com on Chromium (or discord) and share the window of that game
3. Go back to the game

OBSERVED RESULT

The game rendering essentially halts when using a single screen.
With dual screens, the game renders at a stuttering, very low FPS

EXPECTED RESULT

Game should run smoothly


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: 6.12.12
KDE Plasma Version: 6.2.5
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.2

ADDITIONAL INFORMATION

Using nvidia-open drivers.
Not a VRAM issue, nvtop reports only half of my VRAM being used.
Same configuration on X11 (with kwin_x11) works without any issues.
I don't see xwaylandvideobridge being used in the list of processes.