A glitch occurs where passive mobs will glitch out of the fence but soon it corrects itself and they glitch back in. It is a very common glitch and has been in the game since at least 1.3.5 beta. One of the easiest ways to recreate the glitch is so spawn ALOT of mobs in a small area.
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kumasasa
migrated
I'm sorry I searched a few different times but nothing came up like this. I guess searching the wrong thing
Duplicate of MC-10 , please use the search function to see if your bug has already been submitted. Currently over 30% of tickets are being closed as duplicate.