Agroing through the wall and floor is different from running through the floor and wall. On live you could agro but the stuff would always come running along existing paths and agro anything social to it not directly through walls. You would see the train coming instead of it just poping on your head.There were only certain times a mob would warp to you. That was if you were out of range with obstacles like walls or on a cliff after a certain time they would warp.
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