I've never seen it flash white before, what windows are you opening that flash white? Be curious to see if I get the same.
There is some kind of issues with compositioning windows in 11 if they've been developed using plain common controls and/or common controls but designed to adopt the Windows theme (albeit that is a non-standard approach but kind of necessary with the mess Win32 Shell is), I'm not really sure what is going on with it though. Especially but not exclusive to dark theme they will intermittently flash up white for a brief sub-second when first opened, or if created but immediately hidden.
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