Tectonic v2.4.2 ~ Datapack
Terralith_1.21_v2.5.7
Continents_1.21_v1.1.5

For some reason mountain the terralith mountain biomes are not generating properly. The only blocks that generate are dirt and grass blocks instead of blackstone or deesplate, etc.

You need to use Terratonic, not Tectonic.