Hi, I do the Doom mod and in the 1.16.1 version, I have a config for allowing players to start in the Nether, however when my mod is used with yours, there is a null issue in the onPlayerChangedDimension event.

Full log here: https://gist.github.com/AzureDoom/72aa905840f2b31566d477eb045e1e1f

This is this tested on latest 7.0.0 1.16.1 version of your mod, Forge 32.0.61 (that's what my dev is where I tested this but I have tested in 32.0.71 outside of dev).