Where did all my drones go? (3rd mission-arctic)

[Sofie]

3rd mission, the first one up in the arctic where you're relying on trade for food. I forgot to build an immigration center (my bad), and had just build a Z-based powerplant to cover the slight winter shortfall, when all of a sudden a get a massive spam of "not enough workers".

First problem: They're all hiding out in my Z-power plant for no reason I can see. They've filled it to capacity, and there's no way to get them to leave. I put it on lowest priority, put other buildings on top priority and "fill", and: nothing. They're all hanging out int he power plant having some kind of slumber party. I can't turn the building off, I can't put limits on the number of workers, and they're ignoring all the other buildings. IMO this is either a bug, or a lacking feature: I should be able to fix this kind of problem without destroying my buildings.

So I figure I'll eat the nanite cost and recycle the thing, thus forcing them out: I can live with the power shortfall until I get my population back up.

Except the Recycle button is deactivated. I look for my drone overlay, and it's blank: I have two upgraded drone outposts, and no drones. So now I have to restart the mission--obviously, I can't build more drone outposts without drones to build them. I can't do anything at all.

Where the hell did all my drones go? I don't remember getting any notifications about anything happening to them, or any warnings in the game that they needed protection.

[Sofie]

Of course, I answered my own question once I imploded the Z-Plant. You only get drones if your drone outposts are staffed, and of course, mine weren't, because apparently that powerplant is a mindblowingly great place to be.

So I return to my earlier notion that there's some kind of bug in the worker distribution: I should not have one building completely full when it is set to low priority and others are set to "fill" or "high".

[RavensDaemon]

Power producing buildings force fill to keep up with power demand. So basicly, it's operator error on your part using too much power before getting anyway to add more colonist.

[morpheus]

also once people are working there, a certain MINIMUM amount of them WILL always stay there. (50% i think)