Created attachment 179122 [details]
Buttons truncated after using fullscreen video mode (youtube).

SUMMARY
When using the oxygen theme with plasma 6.3.2 then decoration buttons (top right of the window) can be truncated when exiting "fullscreen mode" on application that can display video (VLC, internet browser with youtube) :

STEPS TO REPRODUCE
1. Use a linux distro (I use Arch Linux)
2. Install plasma 6.3.2
3. Install Oxygen theme
4. Run in fullscreen mode a video (VLC, youtube with your favorite browser)
5. Exit fullscreen mode
6. You will notice that the 3 buttons of the window (top right) are truncated (cut off at half height)

OBSERVED RESULT
The 3 buttons (minimize window, maximize window, close app) of the window (top right) are truncated (cut off at half height)

EXPECTED RESULT
The 3 buttons of the window (top right) should not be truncated.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: Arch Linux, Plama 6.3.2
KDE Plasma Version: 6.3.2
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2

ADDITIONAL INFORMATION
- The problem doesn't exist if I use breeze theme.
See attachment for illustration of the problem.