Created attachment 158237 [details]
Screencast of the bug

SUMMARY
***
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***

The context menu of any tray icon will lose all of its contents (or become completely transparent) apart from the selected/focused one, and will gradually have them re-appear if they are selected/focused one by one.

Please see the attached screencast.

This only happens on Wayland, with my laptop's internal monitor with HiDPI scaling.
It does not appear on my external monitor, nor under X11 (with HiDPI scaling).

After going through the list, sometimes, when opening the same context menu again, it may not happen.

STEPS TO REPRODUCE
1. Right-click on any tray icon
2. Context menu pops up
3. Move mouse cursor to any menu item (or use arrow keys)


OBSERVED RESULT

Menu disappears (becomes transparent), and only the focused item will remain / reappear.
After focusing on all menu items, the menu decoration (e.g. segmentation bar) won't recover.

EXPECTED RESULT

Menu stays.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Archlinux
(available in About System)
KDE Plasma Version: 5.27.4
KDE Frameworks Version: 5.105.0
Qt Version: 5.15.9

ADDITIONAL INFORMATION