I am having the same issue: https://github.com/lwouis/alt-tab-macos/pull/705#issuecomment-809008246
code pointer: https://github.com/lwouis/alt-tab-macos/commit/ce6de1402493535cf121fbab8d73105e683c6311
I have 2 Big Sur devices, and they show the same consistent results.
owwlo
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