All chickens in a fence cage run towards the center of a fence block and JUST STAY THERE. Their head is in the fence and they won't move...
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If you did not already, please remember to perform a search before creating a ticket to see if your bug hasn't already been reported. This issue was reported previously as MCPE-6322. Comment your experience there!
This has happen since 0.8.0. I thought this was a feature maybe not?