Building have defined building positions (buildingPos).
Buildings are always flat, the terrain surface is not.
Some buildings have their buildingPos under the terrain surface.

OBS:
If an AI attempts to reach a building position that is under the terrain surface, they can become stuck in an eternal loop attempting to reach the building position.
They typically end up walking in a small circle on terrain surface over the building position.

EXP:
AI should move as close to the building position as possible, then stop.
AI should be able to recognise when they are stuck in an eternal movement loop.