Visual artifacts from background of window

[iodream]

Hi. I'm getting some visual artifacts coming from behind the window when Klassy is in use. It's almost as if there is a 1px line gap between the window decoration and the main window. It's in the upper right corner near the window buttons. Most presets seem to be affected but especially the Redmond ones. If i move the window 1px below or above the glitch disappears and then with every window move 1px more it reappears. This happens with both 6.1.breeze6.0.3 and 6.0.breeze6.0.2.

Is this a bug in Klassy or the graphics drivers? Thanks.

System Info:
Operating System: Arch Linux
KDE Plasma Version: 6.1.3
KDE Frameworks Version: 6.4.0
Qt Version: 6.7.2
Kernel Version: 6.10.3-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 7535HS with Radeon Graphics
Memory: 14,9 GB of RAM
Graphics Processor: AMD Radeon 660M

[iodream]

Issue is related to fractional scaling at 125%. With 100% issue does not happen.

[paulmcauley]

This is an issue related to the kwin/KDecoration2 API in Plasma. Recent releases of Breeze made a dirty hack to try and alleviate it, but I want a proper fix in the API before I look into this