[Crash] Mixin Injection Error with Sodium NeoForge 0.8.12 on NeoForge 1.21.1

[lgbtaye777]

Mandatory Troubleshooting

• Use the LATEST version of the mod and ALL its dependencies (or ideally all your mods). Pro tip: don't install mods manually, use a launcher.
• Don't use Optifine or hybrid servers (Mohist/Velocity/etc) and have tried without big game altering mods (Sodium/Lithium/Connector etc).
• Check that this bug hasn't been reported already.
• Try with the mod alone. If issue does not persist then try removing half of your mods at the time to find the conflicting mod.

Minecraft Version & Loader

1.21.1-NEOFORGE

Issue Details

Hello! I am experiencing a critical crash on startup. The game throws a Mixin injection failure related to fluid rendering compatibility between the native NeoForge versions of Supplementaries and Sodium.

Environment

• Minecraft: 1.21.1
• Mod Loader: NeoForge 21.1.230
• Supplementaries: 1.21.1-3.6.5 (NeoForge)
• Sodium: 0.8.12-alpha.2+mc1.21.1 (NeoForge)

Crash Details

The crash occurs at CompatSodiumFluidRendererMixin. It seems the supplementaries$modifyLumiseneEmissivity method is failing to find its target callback in the newer Sodium NeoForge version (0.8.12).

Error snippet:
org.spongepowered.asm.mixin.injection.throwables.InjectionError: Critical injection failure: Callback method supplementaries$modifyLumiseneEmissivity(...) in supplementaries.mixins.json:compat.CompatSodiumFluidRendererMixin from mod supplementaries failed injection check, (0/1) succeeded.

Logs & Media

crash-2026-05-23_23.52.44-client.txt

[MehVahdJukaar]

alpha for a reason