Created attachment 144374 [details]
Settings panel with missing option

SUMMARY
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STEPS TO REPRODUCE
1. Open System Settings > Display and Monitor > Compositor
2. Hover mouse over running apps in task manager, no thumbnails are shown

OBSERVED RESULT
There's no "Keep window thumbnails" option available. No thumbnails are shown in task manager previews.

EXPECTED RESULT
There should be a "Keep window thumbnails" option. Thumbnails should be shown in task manager previews.


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Manjaro testing and stable/Plasma 5.23.4
(available in About System)
KDE Plasma Version: 5.23.4
KDE Frameworks Version: 5.88.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION
Under `System Settings > Display and Monitor > Compositor` I have these settings:
 - Scale method: Smooth
 - Rendering backend: OpenGL 3.1
 - Latency: Balance of latency and smoothness
 - Tearing prevention ("vsync"): Automatic

I'm using an integrated AMD Cezenne GPU and 5.15.x kernel. The "Keep window thumbnails" was available on this system on Wayland for a while and it worked well, but it seems to have disappeared after an update.