Smelting items in TC Smeltery crashes server

[lailani-f]

Your GTNH Discord Username

cure.starlight

Your Pack Version

2.8.x-nightly-789 + WitchingGadgets-1.5.21-GTNH.pre

Your Server

Zeta

Java Version

Java 20

Type of Server

Don't know

Your Actions

build smeltery, put in iron dust (or any other smeltable item), watch it crash as the recipe finishes

Crash Report

crash-2024-12-25_22.17.25-server.txt

---- Minecraft Crash Report ----
// I bet Cylons wouldn't have this problem.

Time: 2024-12-25 22:17:25 CET
Description: Ticking block entity

java.lang.NullPointerException: Cannot invoke "net.minecraftforge.fluids.FluidStack.isFluidEqual(net.minecraftforge.fluids.FluidStack)" because "mixer" is null
    at tconstruct.library.crafting.AlloyMix.mix(AlloyMix.java:28)
    at tconstruct.library.crafting.Smeltery.mixMetals(Smeltery.java:177)
    at tconstruct.smeltery.logic.SmelteryLogic.heatItems(SmelteryLogic.java:435)
    at tconstruct.smeltery.logic.SmelteryLogic.updateEntity(SmelteryLogic.java:304)
    at net.minecraft.world.World.updateEntities(World.java:1939)
    at net.minecraft.world.WorldServer.updateEntities(WorldServer.java:489)
    at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:636)
    at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:547)
    at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:111)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
    at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

Final Checklist

• I have searched this issue tracker and there is nothing similar already. Posting on a closed issue saying the crash still exists will prompt us to investigate and reopen it once we confirm your report.
• I can reproduce this crash consistently by following the exact steps I described above.
• I have asked other people and they confirm they also crash by following the exact steps I described above.

[lailani-f]

I've added some logging to track where the invalid recipe comes from and it's giving me this:

[00:46:51] [Client thread/ERROR] [TConstruct]: Fluid '<FLUIDSTACK IS NULL>' has inputs '<FLUIDSTACK IS NULL>', fluid.copper.molten'
[00:46:51] [Client thread/ERROR] [TConstruct]: [java.base/java.lang.Thread.getStackTrace(Thread.java:2450), Launch//tconstruct.library.crafting.AlloyMix.log(AlloyMix.java:69), Launch//tconstruct.library.crafting.AlloyMix.<init>(AlloyMix.java:19), Launch//tconstruct.library.crafting.Smeltery.addAlloyMixing(Smeltery.java:119), Launch//com.dreammaster.scripts.ScriptProjectRed.loadRecipes(ScriptProjectRed.java:164), Launch//com.dreammaster.scripts.ScriptLoader.run(ScriptLoader.java:136),

it refers to this line but I have no idea what the FluidRegistry does and how it works
https://github.com/GTNewHorizons/NewHorizonsCoreMod/blob/master/src/main/java/com/dreammaster/scripts/ScriptProjectRed.java#L164