I tried going into minecraft 1.16.5 forge but when it loaded it sayed: Play demo world and something like that

If this issue occurs in a vanilla environment whilst playing on the latest version of the game, then this report would be considered as a duplicate of MCL-16570. Otherwise, modifications and outdated versions are not supported therefore making this ticket invalid.

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We're tracking this issue in MCL-16570, so this ticket is being resolved and linked as a duplicate.

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