The cached device pixel ratio value was stale on window update.

Apologies in advance I've never made a bug report before and don't have or know how to find much info (i pretty much just guessed at the components/version).

I've been trying to track down a bug that freezes KDE plasma when the bar at the bottom of a fullscreen youtube video appears specifically in firefox. The bug does not occur in falkon. I purposely recreated the crash and ran:

journalctl /usr/bin/plasmashell -S "2024-10-24 09:25:00" -U "2024-10-24 09:26:00"

That being the time between just before the crash and reboot.

The output was:

The cached device pixel ratio value was stale on window update.  Please file a QTBUG which explains how to reproduce.

And:

qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile