A bug occurs when a zombie recognizes an open trapdoor as a block and falls down.
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Thank you for your report!
We're actually already tracking this issue in MC-50556, so this ticket is being resolved and linked as a duplicate.
However, that ticket has been resolved as working as intended, which means that this is not considered a bug and won't be fixed.
Please be sure to use the search feature before creating a ticket to see if the issue has already been reported.
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