Minecraft 1.20.1 with Forge 47.1.3, launcher reports that this mod failed to inject while starting the game.
error-2023-12-22_16.17.53.zip

That log shows nothing of the sort, nor does it show any crash or failure to start, nor does it show TFC being the root cause of anything. There's nothing here we can actually look into, nor reproduce.

Now I've installed a new Minecraft instance (1.20.1 with NeoForge 47.1.84) and TFC crashed the game. Could you add support for NeoForge?
error-2023-12-27_20.55.17.zip

We support NeoForge within the version range declared.

Mod tfc requires forge 47.1.3 or above, and below 47.1.6, 47.2.6 or above
Currently, forge is 47.1.84

We can't support newer versions due to a bug (neoforged/NeoForge#256) in NeoForge which is unfixed in 1.20.1