Comment 3 for bug 896173

This still happens for Bio Reactors in 15.349.109.

I also found a better way to test it: repeatedly load the Chrono Locomotor infantry into a Bio Reactor and make it leave. The cell where the infantry will unload will be blocked, as if it was still standing there. After doing this multiple times, the infantry will be unable to leave Bio Reactor (as if there were units standing where it wants to unload) and all cells clockwise from the left to right of the Reactor will be unbuildable. The only way to make infantry leave the Reactor is to destroy/sell it.