I have generated over a hundred worlds, but 95% of the time it spawns me on a stony_shore or ocean biomes.

I am looking for the huge mountains with forests nearby, but I think this mod has completely stopped generating those.

I am using tectonic 2.4.2 and minecraft 1.21.4 and I dont think Ive had this issue before.

This is down to bad luck with ocean and land scales being wayy off from vanilla. There's still many seeds in my testing that spawn you solidly inland.