Device: LG V20
Animals continuously push and crowd against closed doors, making them disperse unnaturally in enclosures that employ doors. Animals do however, behave naturally towards closed gates.
The screenshots below demonstrate several examples of animals exhibiting this behavior, along with an example of a pen full of chickens exhibiting the natural behavior and dispersion in a pen employing a gate for comparison.
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Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-28280.
It has been noted that mobs other than Llamas are affected, too.
Your additional information and observations are very useful, so if you can add them to the comments section of the parent issue it would be appreciated.
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Confirmed in Windows 10 1.2.8.0 using cows, sheep, and pigs. I also tested single skeletons, husks, strays, and creepers. They don't always go to the door immediately, but do eventually, and once they do some other default behaviors such as looking around seem curtailed. Eventually they random-path somewhere else, but return to the door almost immediately or after a short interlude.