Created attachment 143672 [details]
Please see the screen recording.
STEPS TO REPRODUCE
1. Open the Bluetooth applet
2. Uncheck the "Bluetooth on" button.
There's a small dark rectangle on the upper left corner, where the button was. It vanishes, when the mouse is moved over an different element and the region becomes redrawn.
Operating System: Fedora Linux 35
KDE Plasma Version: 5.23.2
KDE Frameworks Version: 5.87.0
Qt Version: 5.15.2
Kernel Version: 5.14.17-301.fc35.x86_64 (64-bit)
Graphics Platform: X11
Style: Breeze dark
Created attachment 143673 [details]
Same goes for the clipboard, which shows the same dark rectangle, when opened. It vanishes however, as soon as the mouse is moved over the applet.
I already tried `rm ~/.cache/*plasma* ; killall plasmashell && kstart5 plasmashell` but w/o success.
*** This bug has been marked as a duplicate of bug 445516 ***
Oh sorry I missed the last comment.
Seems like an issue with the PlasmoidHeading component.
*** This bug has been marked as a duplicate of bug 438178 ***