Hi, I think there is a bug that makes depots disappear when uppdating a mod IF the depot is placed using the wall trick.
Just did a test and placed 6 depots, one of each. 3 were placed regularaly and 3 were placed with the wall seperating them from the road. I then updated the mod "milestones" (Bug happens with all mod updates) and started the game again. The 3 depots placed with the wall seperating them from the road was gone, with their drones and whatever was in them.