Username: Ewapenguin

Brief Discription: I found a glitch where zombies, unsure about all other mobs, will run to an opening to where I'm hiding (not the glitch part), but if I have a trapdoor that is closed, they still run, but if its open, they cant find an opening.

Instructions:
Have a 1 block wide hall as the only way to get where your camping.
On the side with a monster spawner make a doorway that is 1x2.
in the hallway put a trapdoor that is closed and in the doorway put one that is open.
Zombies will run to the closed one.

Expected Results: Zombies ran to the closed trapdoor instead of through the opening.

Results: same as expected result.

Evidence: (hope I did picture right.)

 

A mod told me it might just be minecraft logic.