Bug 443480

SUMMARY

If you use two monitors and have a panel with the Global Menu widget on each monitor, it glitches out to where it will only follow one monitor. For example, if I have Monitor 1 (Primary) and Monitor 2, if I open Dolphin, there will be no Global Menu on Monitor 1. If I move it to Monitor 2, the Global Menu activates on BOTH Monitor 1's panel and Monitor 2's panel. If I move Dolphin back to Monitor 1,   the Global Menu (on both monitors) disappears. If I delete the Global Menu widget and re-add it, it will temporarily work as expected (where the Global Menu activates when the app is on that monitor). 

Actually now that I'm typing this I tried removing the second Global Menu and the first one is still only following monitor 2.

It's hard to explain, so here's a video:
https://youtu.be/LveDjmk34KY


STEPS TO REPRODUCE
1. Have two monitors with a panel on each monitor 
2. Add global menu to the main monitor's panel (or both panels)
3. For a short time it will work as intended, but it always reverts to this behavior at some point (always after a reboot too from what I can tell)

OBSERVED RESULT
Global Menu follows the wrong display


EXPECTED RESULT
Global Menu follows the correct display


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux, kernel 5.14.7
(available in About System)
KDE Plasma Version: 5.22.5
KDE Frameworks Version: 5.87.0 
Qt Version: 5.15.2

*Note: Under the Version drop down on this bug report page, 5.22.5 isn't available. I'm on 5.22.5.