Debian 11
KDE Plasma 5.20.5
KDE Frameworks 5.78.0
Qt 5.15.2
Kernel 5.10.0-9-amd64
The buttons on the window bar keep disappearing. If I go to settings I can choose another, apply, and they will be back, but only to disappear again later. To be more precise--the bar is still there, it's just that all buttons are gone. The bar is solid black.
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