I noticed that when mobs chase you, you can place rails in front of them, and they will not be able to get to you, they try to path find through the rails but they cannot get on them
It's hard to explain. Here I'm leaving a video of this bug video
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Duplicate of MC-33359 which is marked as Works as Intended
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We're tracking this issue as MC-33359, so this ticket is being resolved and linked as a duplicate.
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I can't watch the video
but I know what you are talking about. ALL mobs can't go through rails (well except flying ones, they can just fly above rails)