^ this screenshot is taken in a single-biome deep dark world using sully's mod 3.1.1, but the same issue happens in a regular world (and they spawn a LOT)

no mods were installed except sully's, blueprint 7.0.0 & geckolib 4.3.1 (and forge 47.2.0)

Ah yeah that was an oversight on my end. Will be fixed in the next update!
Thank you ^^