Items picked up by mobs will disappear.
example: The fox has wheat in it's mouth, which it's spawned with, I throw the sweet berries on the ground, the fox picked up the berries, but it didn't switch the wheat with berries, instead, the berries just disappeared, and the wheat is still in fox's mouth.
We're tracking this issue as MCPE-71542, so this ticket is being resolved and linked as a duplicate.
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