Created attachment 143054 [details] Volume applet being transparent despite the transparency in panel settings set to Adaptive. SUMMARY 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 OBSERVED RESULT System tray applet is transparent. EXPECTED RESULT System tray applet should become opaque. SOFTWARE/OS VERSIONS 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 ADDITIONAL INFORMATION 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.
Can confirm.
*** This bug has been marked as a duplicate of bug 439025 ***