Bug 514594

Created attachment 188517 [details]
screenshot of stray artifact

SUMMARY
A stray red pixel artifact appears after some time. A reload with `kwin_wayland replace &` removes the artifact. I'm not sure which application / action triggers this event. I've attached logs from the relevant timeframe below as well though I'm not sure they're related. 
The stuck pixel moves with the change of scale, so it's not an issue with my display.

The stray artifact looks like it's mostly appearing on Firefox windows, but this is just speculation as I cannot pinpoint the exact time.

Please let me know if you need more information.

STEPS TO REPRODUCE
1. Install CachyOS, update packages
2. set display settings as in screenshot
3. use for some time

OBSERVED RESULT
Stray red artifact appears after some time.

EXPECTED RESULT
Stray red artifact should not appear.

SOFTWARE/OS VERSIONS
Operating System: CachyOS Linux 
KDE Plasma Version: 6.5.5
KDE Frameworks Version: 6.22.0
Qt Version: 6.10.1
Kernel Version: 6.18.5-2-cachyos (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 5800X3D 8-Core Processor
Memory: 32 GiB of RAM (31.3 GiB usable)
Graphics Processor: AMD Radeon RX 6800 XT

ADDITIONAL INFORMATION
> glxinfo | grep "OpenGL version"
OpenGL version string: 4.6 (Compatibility Profile) Mesa 25.3.3-arch1.5


### Log excerpt

> journalctl -b 0 | grep -iE "kwin|drm|amdgpu|mesa"
[...]
Jan 14 13:54:49 host kwin_wayland_wrapper[352488]: warning: queue "mesa egl surface queue" 0x55b9829f4a00 destroyed while proxies still attached:
Jan 14 13:54:49 host kwin_wayland_wrapper[352488]:   wp_presentation#37 still attached
Jan 14 14:26:21 host kwin_wayland_wrapper[850039]: warning: queue "mesa egl surface queue" 0x55dca198d7d0 destroyed while proxies still attached:
Jan 14 14:26:21 host kwin_wayland_wrapper[850039]:   wp_presentation#37 still attached
Jan 14 14:34:45 host steam[995477]:     driver_id: k_EGpuDriverId_MesaRadv
Jan 14 14:48:37 host kwin_wayland_wrapper[1104154]: warning: queue "mesa egl surface queue" 0x56420a478340 destroyed while proxies still attached:
Jan 14 14:48:37 host kwin_wayland_wrapper[1104154]:   wp_presentation#37 still attached
Jan 14 14:57:27 host kwin_wayland_wrapper[1202042]: warning: queue "mesa egl surface queue" 0x55bbf0749810 destroyed while proxies still attached:
Jan 14 14:57:27 host kwin_wayland_wrapper[1202042]:   wp_presentation#37 still attached

### Hardware summary
Radeon 6800XT