I was making a creeper farm and realized creepers were having troubles getting scared far away by cats. they only ran about 2 blocks when they should have ran 6 blocks away. Also when there is no ceiling they run from cats but never care to go over the edge even when the fall is one or two blocks.
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I changed all my trap doors to oak and it works beautifully again. So the bug is in the new trap doors.
Seems to be fixed for 1.13.1, probably because MC-132358 is fixed.
Might the trapdoor issue relate to the following issue?
MC-132358
Maybe you can rebuild the farm with the oak-wood trapdoors and check the behavior of the creeper again.