when I install Tectonic (this version https://modrinth.com/datapack/tectonic/version/W3PK2UDI) along with lithostitched
the game runs and I can generate a world however I get vanilla world gen.
When I try other world gen mods like big globe or jjthunder they work fine

Is the mod enabled in the config? Send a screenshot of the config and the worldgen in-game.