I have an issue where when my monitors turn back on after a period of inactivity, the desktop wallpaper on the second monitor reverts to the default (presumably because the second monitor takes a few seconds longer than the first to turn on). It doesn’t happen every time but often enough that it’s become annoying. It’s never happened after a reboot, only when waking the monitors after I’ve been away from the PC.
So far, on the advice of various posts (which were all about this happening after a reboot, admittedly), I’ve tried disabling KScreen and changing the Desktop Session settings to “Start with an empty session” but neither had any effect on the issue.
In case it’s relevant, I’ll also add that initially when this happened any open windows on the second monitor would get moved to the first but that stopped happening once KScreen was disabled.