Created attachment 169927 [details]
Christmas tree artifact along the right edge

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SUMMARY


STEPS TO REPRODUCE
1. Observable as soon as logged into the desktop environment. The darker the background, the more noticeable. For example, open any window (e.g. Chrome) -> maximize -> open bugs.kde.org
2. If your system theme is dark, or Chrome uses Dark Reader, most of the page is dark, including the right edge, where the scrollbar is.
3. Notice within the last column of pixel (i.e. the rightmost line), speckles (could be any of R, G, B) shows up and disappear at random locations, like a Christmas tree. Currently most of them are within the 25%~50% region from the top to bottom.
4. This may have to do with DPI and window settings. I use mine at 150%, and tweaked the sizes in window settings. If I switch back to 100% things are fine.

OBSERVED RESULT
Colorful speckles at the right edge

EXPECTED RESULT
No such artifact

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 6.0.4
KDE Frameworks Version: 6.2.0
Qt Version: 6.7.0

ADDITIONAL INFORMATION
Kernel Version: 6.8.10-300.fc40.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 4 × Intel® Core™ i5-7500 CPU @ 3.40GHz
Memory: 46.9 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 1050 Ti/PCIe/SSE2
Monitor: ASUS VA32AQ