SUMMARY
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After unlocking screen when you had previously used show desktop on a multi monitor display, the panels on non-primary displays disappear for a few seconds before becoming visable.
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STEPS TO REPRODUCE
1. Have multi-monitor setup
2. Use 'show desktop' button/hotkey to hide windows/show desktop.
3. Lock screen
4. Log back in
5. Unhide desktop with button or shortcut

OBSERVED RESULT
Watch all windows on non-primary displays disappear and you can only see your background, cursor can go over windows and panel to interact with them, even drag/move them onto your primary monitor. Eventually after a few seconds the windows and panel will re-appear.

EXPECTED RESULT
After unhiding desktop after unlocking screen panel and windows should all be visable.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Arch Linux
(available in About System)
KDE Plasma Version: 5.25.5
KDE Frameworks Version: 5.98
Qt Version: 5.15.6

ADDITIONAL INFORMATION
Using AMDGPU, mesa and Xorg, haven't tried Wayland yet. Have dual identical 1440p 144hz monitors connected with Displayport.