When I tried opening a world it crashed. The error said something about stalwart_dungeons:tungsten_hoe, so I tried getting Stalwart Dungeons, and then it worked. I also tried turning off both Stalwart Dungeons and Tetranomicon, and it worked. I saw in Relations that Stalwart Dungeons was listed as an Optional Dependency, so I'm guessing this was unintentional?

(1.20.1 btw)

Does this happen with only Tetranomicon (and its required dependencies, Tetra and mutil) installed? If not, what other mods need to be present for this to happen?

Ah. It seems that just Tetronomicon (plus dependencies) doesn't cause the crash. The crash on world creation only starts happening when there's both Tetronomicon and Enderite.

Enderite=no crash
Tetranomicon=no crash
Enderite+Tetranomicon=crash
Enderite+Tetranomicon+Stalwart Dungeons=crash
Enderite+Tetranomicon+Stalwart Twilight Forest=crash
Enderite+Tetranomicon+Stalwart Dungeons+Twilight Forest=no crash
Tetranomicon+Stalwart Dungeons+Twilight Forest=no crash
Stalwart Dungeons+Twilight Forest=no crash
Enderite+Twilight Forest=no crash
Enderite+Stalwart Dungeons=no crash

Btw when I had both Stalwart Dungeons and Tetranomicon toggled on, and I turned off Stalwart Dungeon, the CurseForge launcher automatically turned off Tetranomicon.

That's amazing, thanks!

I've got it figured out now - the dependencies are tangled a little, so if Enderite is present Tetranomicon tries to load Stalwart and Twilight content instead of checking whether they're present independently. I'll upload a fixed version tonight.