SUMMARY
When snapping a window to the top-left or top-right of a display, the System Monitor window goes partially under the top panel on all except one of my displays, which is a scaled display marked as my Primary display. On my other displays it will go underneath their panels. I cannot reproduce this with any apps other than the System Monitor. Hiding window decorations doesn't stop this either.


STEPS TO REPRODUCE
1. Open System Monitor
2. Snap window to top-left or top-right of a secondary display.
3. Window will appear under panel


OBSERVED RESULT
System Monitor appears under panel of every monitor that is not my scaled primary monitor, though I am not sure if this is related.


EXPECTED RESULT
System Monitor should not appear under panel


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.18.3-zen1-1-zen (64bit)
KDE Plasma Version: 5.25.0
KDE Frameworks Version: 5.9.50
Qt Version: 5.15.4

ADDITIONAL INFORMATION
Tested on Wayland. Have not tried X11