Because pillar collision range is circle, it leave gaps to trick path finding.

The radius on the pillar was tuned to have enough of a gap for this wall setup.

Changed Status to Closed

it's the same as the case when you build with only walls. And you can find the hound and moonpig will attack the walls when you try to guard the moonbase in this way. the pillar has registered the pathfing walls, and its affect to the pathfinding result just works as same as the wall.