Created attachment 143054 [details]
Volume applet being transparent despite the transparency in panel settings set to Adaptive.
System tray applets do not follow the adaptive transparency in some cases (stay transparent despite maximized window)
STEPS TO REPRODUCE
1. Set Panel transparency to Adaptive
2. Open maximized window on a desktop
3. Open one of the applets from the system tray
System tray applet is transparent.
System tray applet should become opaque.
Operating System: KDE neon 5.23
KDE Plasma Version: 5.23.2
KDE Frameworks Version: 5.87.0
Qt Version: 5.15.3
Kernel Version: 5.11.0-38-generic (64-bit)
Graphics Platform: Wayland
Processors: 4 × Intel® Core™ i5-2520M CPU @ 2.50GHz
Memory: 7.7 GiB of RAM
Graphics Processor: Mesa DRI Intel® HD Graphics 3000
Calendar applet works okay as you can see in another attachment, problem looks to only be with System tray applets.
Created attachment 143055 [details]
Calendar applet being (correctly) opaque in the same situation.
*** This bug has been marked as a duplicate of bug 439025 ***