from what I observe, npc DO open doors as they pas throw them. The thing is, they do not wait for the door to open, they walk THROUGH them as door is still opening. Thats why you add 1 sec stop point before and after the door, to make it look real as if the mob has opened the door =)
However when mobs is aggroed through the door, he does NOT always runs DIRECTLY through the door passage, in which case, the door is not triggered.
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