Some hostile mobs (cows, pigs, sheep, rabbits, chickens and horses) disappear, sometimes they only disappear or sometimes if the game is suddenly closed.
In the image a pen appears where there were 2 adult pigs and 2 baby pigs, and now that I opened the game they were no longer
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Thank you for your report!
We're already tracking this issue at MCPE-21416, so I will resolve and link this ticket as a duplicate.
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