Its a weird visual bug and it is kind of annoying to get rid of, you need to update the blocks it affects and doing that on a chunk border can make it affect another adjacent chunk.
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Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-44650.
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I'm having the same issue. It started after the latest beta update on Xbox One and seems to be pretty sporadic. +My cat seems to have an issue where its head mesh is situated lower than it should be.