Collision
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It has been said before, but its spread out for a bunch of different objects. But it seems that some structures lose collision if you only give your character a single movement command. On the other hand if you are holding down your LEFT CLICK it will result in you going around said objects.
This is some pathing issue and is probably related to the weird pathing your character takes when trying to take/remove items from the stockpiles that are linked to buildings (ore/wood).