I created a map that is pretty much all urban, so I don’t know if this contributes.
But an issue I keep coming across is that acidic ant hives spawn normal ant larvae chambers (which they then usually kill) and normal ant queen chambers (in which case there is usually a large battle that the queens lose). I know that the wiki states that upon death of the queen, regional spawns will slow.
I just wanted to report this since so far, both acidic ant hives I’ve found have had this issue.