Nether fortresses don't generate correctly worlds that are created before 1.16(only in unexplored chunks)(not on worlds that are created in 1.16

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We're tracking this issue as MCPE-84772, so this ticket is being resolved and linked as a duplicate.

That ticket has already been resolved as Won't Fix, which means this is considered a bug but won't be fixed. The description of that ticket or the comments might explain the rationale. Please do not leave a comment on the linked ticket.

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