This is most apparent with the zombie and persian cat. The persian cat has a black square on where the snout should be, while the zombie has a black box on it's head.
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Thank you for your report!
We're actually already tracking this issue in MC-163227 and MC-163008, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main tickets it would be appreciated.
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