SUMMARY
I have 3 monitors on my HP laptop.
I have configured the monitors with their own task manager and selected, under "show only tasks", the options to only show tasks from the current screen (I'm not using multiple desktops or activities).

On my primary monitor this works fine.  Only tasks that are actually on that desktop are showing in the task manager.

On the other two monitors, the task manager is showing all tasks from all 3 monitors.

This appears to happen after monitors go to sleep and wake up.

If I switch from the standard task manager to the icon only task manager, the task manager shows the correct tasks. If I switch back to the standard task manager, the correct tasks are shown, although they will show all tasks

STEPS TO REPRODUCE
1. 3 monitors connected
2. A task manager panel on each monitor.
3. Enable "only show tasks from current screen" in all 3 task managers
4. Open windows
5. Observe task managers show correct tasks from the appropriate monitor.
6. Allow monitors to go to sleep
7. Wake system & monitors

OBSERVED RESULT
Task manager on primary monitor shows only tasks on that monitor, but task managers on the other two monitors show all tasks.

EXPECTED RESULT

Task managers on all monitors only show tasks from the appropriate monitor.

SOFTWARE/OS VERSIONS
Windows: n/a
macOS: n/a
Linux/KDE Plasma: 6.0
(available in About System)
KDE Plasma Version: 6.0.0
KDE Frameworks Version:  6.0.0
Qt Version:  6.6.2

ADDITIONAL INFORMATION