When TerraFirmaCraft is installed, and a world is made with the TerraFirmaCraft world type, and the lost cities profile is set to default, lost cities will not generate in the world. I have tried to /lostcities locate different city parts, which does return finding multiple pieces, but when teleporting to them, but they do not appear in the world.

Steps to reproduce:

1. Install TFC and Lost Cities
2. Create a world and enable lost cities generation
3. No lost cities structures generate

Note that when the default (vanilla) world type is selected, structures generate without issue.

Mod list:
Patchouli (v1.20.1-84-forge)
TerraFirmaCraft (v3.2.12)
The Lost Cities (v1.20-7.3.5)

That's not a bug in Lost Cities. It's up to TFC to call the correct pieces so that features can work

Do you mean features as in Minecraft features? I believe TFC uses biome tags to place them as opposed to how they are added in vanilla. I don't know if it's outside of the scope of this mod to add compatibility for that with this mod though.

Well then it's up to a datapack to add the Lost Cities feature

It's only these two features that this mod uses to generate the cities I am assuming? And should this issue be closed then?

yep