Plasma desktop crashes when monitor turned off

[HuskyDog]

Executive Summary: Raspberry Pi 5, Plasma icon panel and desktop wallpaper disappear when monitor is turned off.

I have a Raspberry Pi 5 with a single monitor connected via HDMI. The display and desktop have worked just fine for many months. I recently updated the Plasma desktop to 6.2.4. Since then I have run into a serious problem. I can login and operate all of the applications successfully until the monitor is switched off. When I switch it back on again, the icon panel at the bottom of the screen has disappeared and so has the wallpaper. Both are now black. The mouse pointer is still visible and any open applications continue to run properly.

Any of the following three actions count as "Switched off": Turning off the monitor via the power button, selecting a different monitor input port, allowing the computer to switch off the monitor to save power due to inactivity.

The effect is 100% reproduceable.

If I am logged out and looking at the SDDM login page, then switching off the monitor has no effect and I can login just fine afterwards.

Restarting the display-manager service re-sets the issue.

I have tried re-booting.

Any suggestions gratefully received!

[asturm]

That's a nasty bug. Firing up krunner you can easily restart plasmashell though without losing your session.

[HuskyDog]