Hello, I'm using Tectonic with Terralith and Terrablender as mods for a Fabric server. Is it possible that this is affecting the spawn of these blocks? I moved more than 10k block from spawn, I'm checking with spectator and I can't find any of these blocks... Any suggestions?

Terralith moves alternate stones into their own cave biomes. You can use this addon to get old alternate stone generation back.