@Levis: Here are some results from my tracing:
Code:
Build: Windmill here
Build: adding collider
AddCollider for Windmill
Trying....
Finding....
Loading....
Adding check 0
Looks like the game adds one single check and CollideCheck never does actually get called.
And you're right, it DOES work after leaving the location and coming back again.
No notable performance loss either. This is definitely the best BuildingSet collision I have ever seen; I'm impressed!
Funny effect: If you set time compression to 20x, you CAN still run through the mill.