Minecraft version: 1.20.1
Forge version: 47.3.22
IV version: 1.20.1 beta
Create Tramways version: 0.1.3
This can be replicated by:
1: setup a forge instance with Immersive Vehicles, Create and Create: Tramways.
2: start the game
3: Crash

V Potential fix

(Credit: Developer of Create:Tramways aka C1200)

Well, when that fix happens can you let me know? I've tried to relocate JLayer with shadowing for some time now, but can't figure out what I'm doing wrong with Gradle as it never seems to work. If Create: Tramways can get it to work, then I can copy their work for MTS.

That being said, this is a bug report for an un-released Beta, so doesn't belong on Git. Closing.