There is a major issue in this version that causes all animals to despawn even if they have been leashed, fenced off, tamed animals (horses to be specific) and named animals. I have not seen this issue effect villagers or tamed cats, dogs, and parrots
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Thank you for your report!
We're actually already tracking this issue at MCPE-47922, so we will resolve and link 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.
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I have this issue too, my livestock despawned and im super mad