I'm building a custom world-gen that includes some biomes from Twilight Forest. I've got the biomes generating in the world, but now I'm encountering an odd error.

My intent/expectation:
The biome should generate with a thin layer/topblock of dirt or grass (I've tried both), with red foliage and grass, dotted here and there with Quark's nether smokers. Below that, it should be netherrack all the way to bedrock, dotted with Quark basalt and nether quartz.

What I'm getting:
No dirt or grass at all, and no smokers. Just a solid plain of netherrack, marked with the occasional obsidian column and mangrove trees -- the foliage of which seems normal and green. It does, however, look like the basalt and quartz are generating in small amounts.

Here's the scripting I'm using: https://pastebin.com/uF3Q1MDg

BiomeTweaker for MC 1.12 is now EOL, so I will not be addressing bugs that are related to BT - MC interactions. If this bug persists in BiomeTweaker for MC 1.18, please submit a new issue.

It doesn't seem like BTCore is properly applying it's tweaks. This looks to be a problem with your setup not allowing some core mods to properly execute.

Do you have BiomeTweakerCore installed with the relevant option enabled in the config?

I do, yeah.

Further wrinkle: I remembered I could just pull grass blocks out of creative mode, so I put some down to test the grass color, and it's just a dark green instead of a shade of red.

I'll need a full log file then.

Here ya go: https://pastebin.com/U81ybf6z