Scripts

Yes, as KioM said, the grid of cells for the Fortress dwelling does not match that of the other level 1 buildings. This can be resolved by destroying the building (RazeBuilding) and placing a new one (CreateDwelling).

It gives an error in the console, stating that the building is indestructible.

Added 14 minutes later
I fixed the suicide bug using teleportation. It now teleports the unit one cell back with a teleport animation. It works. It survives.