When I try to use this mod with TerraFirmaCraft (version 3.1.2-beta), it shows me this error:

I am unable to reproduce this (TFC 3.1.2-beta, Patchouli 1.20.1-83-FORGE, World Preview 1.1.3, Forge 47.2.17). What versions are you using? Could you please attach the full Minecraft logs?

Closing because of a lack of response.

Additionally, the Y intersections view will always be a blank screen with TFC, because the the TFCChunkGenerator has a dummy implementation for the getBaseColumn method:

https://github.com/TerraFirmaCraft/TerraFirmaCraft/blob/v3.1.2-beta/src/main/java/net/dries007/tfc/world/TFCChunkGenerator.java#L643-L646