Hi thank you,
We're struggling to reproduce what is shown in the excellent video from luckman212 or any sort of window-over-window corruption.
Unless it's a mirroring setup of course, in mirror we can easily see similar issues, which are a problem introduced in macOS some time ago.
Are you using mirror? If not any specific setting maybe in Accessibility/Display?
One check you may want to do is to take a screenshot of the whole desktop when the issue is visible. Is the corruption visible also on the screenshot?
Best regards,
Carlo
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