I'm imagining that theres some sort of check involved that stops pops being queued up to grow on 0 habitability planets, and thus is terminating the new pop (and resorting to "what pop is allowed to grow here" logic).Not sure where the best place to ask is, so I'll ask here: is it intentional that after colonizing a planet with 0% habitability you have to force the growth each time for each new pop of the main species (otherwise they go into decline)? It feels very clunky to say the least - either it shouldn't be possible to lock the species in for growth at all (as an authoritarian), or it should stay locked in for growth under the horrific conditions I'm forcing upon the pops. Certainly wouldn't have expected this: lock in species for growth on 0% hab to stop pop decline on fresh colony -> new pop grows, growth resets to servant species (which has higher habitability) -> ruler pop goes into decline -> go back to start. Scenario involves a Nihilistic Acquisition lifeseeded xenophobic authoritarian warrior culture empire that grows by subjugating other species. That was the idea, anyway.
With the population controls enabled policy set I'd have expected to be able to fully determine whether a pop grows or declines on a planet, not be forced to never grow anything but the ruler pop. Granted, I haven't played with Authoritarian slavery in a long while, so I don't actually know how this behaved with the introduction of the new economy/pop system.
Realistically the correct response would be to prevent them being grown at all, even with forced selection.