So, basically, to test out some things in the game, so I could get used to playing again, I set up a world with the intent to use debug menu to re-familiarize myself with stuff. Revealed map, and I noticed this ant hill…
Oddly, teleporting to the anthill, with a clairvoyance artifact reveals that most, if not all, of the rooms are not connected. Just single circular caves with no means of going from one section to another.