Title, spent about 2 hours looking as well as using the locate command by tping 1k blocks out and running. I am assuming they aren't spawning. I know that quark's dungeons are spawning, though, so I'm posting an issue here.

Seems like this could be resolved if there were an option for biomes to generate in. To make them spawn using crafttweaker:
<tag:worldgen/biome:dungeoncrawl:has_structure/dungeon>.addId(<resource:modId:biome>);
For terrafirmacraft this would be something like
<tag:worldgen/biome:dungeoncrawl:has_structure/dungeon>.addId(<resource:tfc:plains>);