Version Info

• Minecraft, 1.21.4
• Fusion, 1.2.3-neoforge-mc1.21.4

• Neoforge 21.4.86-beta

• No optifine

Steps to Reproduce

• Idk, just use all the mods I use. They all work fine, but Fusion makes me unable to play

• Error message I get is:
  "The game crashed: initializing game
  Error: java.lang.IllegalArgumentException: A non-vanilla reload listener com.supermartijn642.fusion.model.modifiers.block.BlockModelModifierReloadListener@7677d320 was added via mixin before the AddClientReloadListenerEvent! Mod-added listeners must go through the event."

• Mod has worked fine on 1.21.1 with an older version of the mod and older version of neoforge.

Crash report (~/logs/latest.log)

https://gist.github.com/BasquiatThe1/de40cf76bce2057c35ccd029cd7001b6

This is caused by breaking changes in NeoForge 21.4.84-beta.

This is caused by breaking changes in NeoForge 21.4.84-beta.

So downgrading should hopefully fix it then

This is caused by breaking changes in NeoForge 21.4.84-beta.

So downgrading should hopefully fix it then

Ok after some messing around I managed to fix it by downgrading the version of neoforge and the versions of some mods for that to work as well. Weird issue but oh well. Everything seems to be fine now.

I accounted for the changes from neoforged/NeoForge#1915 now in Fusion version 1.2.4, so it should work with NeoForge 21.4.84-beta and newer.
Thank you for reporting the issue!