Not sure if I should file a bug about this.
Remains rebuilders are still sort of "messed up" in priorities.
If your command station goes down, then during the countdown time where it can't be rebuilt, the remains rebuilders won't target it, but instead will target things like turrets. Fair enough.
However, if there is not enough energy left for the turrets (like if you set up an energy reserve), then the remains rebuilders will try and fail to rebuild the turrets. Again, fair enough.
However, once the command station becomes eligible to be rebuilt (the countdown, well, counts down), the remains rebuilders will stubbornly continue to try to rebuild the turrets, just sitting there, instead of breaking off and rebuilding the command center (so it can rebuild the energy reactors needed to rebuild the turrets).
If I save and reload, if the command station is now eligible to rebuild, then the rebuilders will break off and rebuild the command center, but they won't do it on their own without a reload.
I can try to provide a save during the time that the command station rebuild timer is still going so the cleanup drones will "reacquire" the command that will make them stuck.