Greetings Sir/Mam
I have seen this report in the changelog of 1.15.0.56 BETA, where the sheep will update after when it gets sheared. But this bug is still presented in the latest BETA and i have a proof of the bug in the form of a video.
Hoping this information is helpful to fix the bug.
Thank you
Thank you for your report!
We're actually already tracking this issue at MCPE-63188, 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 ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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