this bug is actually the classic browser version of minecraft. the bug is that if you send your friend a link to join you in classic.minecraft.net your friend will get a white screen.
I know this says this is a 1.16 issue but its actually not
MC-204933
classic.minecraft.net friend join link does not work
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We're tracking this issue in WEB-1285, so this ticket is being resolved and linked as a duplicate.
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