Zombies, Creepers, Skeletons are all behaving like they have no AI for pathfinding at all. In bamboo forests or inside mineshafts they are unable to get around a corner (or double corner), just to reach me. Instead they are searching for the shortest direct path and get stuck.
I remember a much advanced mob behaviour a long time ago.
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Why is this already closed? Just go into a mineshaft, go to a typical crossing of shafts, let a zombie see you, run around the corner. He does not follow but stays inside the corner of the shaft you ran from.

Please re-open this, it's not an issue of mobs not moving like the link to a duplicate.
See images attached, all mobs generally move. I made sure they see me and just got around the corner, but they don't go around it (they are not stuck, but choose a stupid path).
Can you upload a screenshot? They see bamboo as a block so they probably dont think they can see you