No matter what Forge version (checked 47.2.0, 47.4.0, 47.3.25), the TxniLib Forge 1.0.24 crashes when "Optifine 1.20.1 HD U I6" is also added to the mods. Works just fine with different other mods if I remove Optifine.

Logs:

debug.log
latest.log

Don't use optifine.

Bruh, it's normal to use it 😅