Created attachment 167978 [details]
Bug

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SUMMARY
Hello! Every time I'm opening an application some bright blinks appear at the bottom of the screen under each application, even when I close them all. After a reboot this problem still not solved. The same problem appears when I open  Kate, but near on the top right edge. Bug Screenshot is in attachment.

STEPS TO REPRODUCE
1. 
2. 
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OBSERVED RESULT


EXPECTED RESULT


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version:  6.03
KDE Frameworks Version: 
Qt Version: 6

ADDITIONAL INFORMATION