Rabbits will get stuck next to glass panes. I put rabbits into a room and the walls are glass panes and I've noticed that the rabits will get stuck and not be able to move. To unstick them I use a lead to pull them out and that seems to work but they will end up getting stuck again.
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Seem like rabbit also get stuck on iron bar. Since there is a similar bug for java edition there is high chance that they also get stuck on other blocs like fences.
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I’m pretty sure this occurs because rabbits are smaller than half a block, and when they are inside the block space of a glass pane the navigation function cannot determine whether they are on a side that would allow them to move out of the pane or not. Either that, or it prioritizes trying to move in a particular direction that happens to be on the other side of the pane’s collision box. Same happens with chickens and fence gates, as I commented on (MCPE-46805).
Can confirm this glitch occurs for iOS as well. Likely occurs across multiple platforms.