[1.12.2] Can't smelt custom block

[Bertrahm]

I'm trying to add a smelting recipe for Rutile Ore of my mod, but I've ran into a problem:

GameRegistry.addSmelting(input, output, xp)

doesn't work with blocks, even though a method with a block input exists... Items/ItemStacks work perfectly, but it wont smelt or even shift-click into the furnace If I use a block as the input.
Here's my registration code:
 

package com.linesix.akhaten.common.blocks.ores;

import com.linesix.akhaten.common.blocks.registries.Ores;
import com.linesix.akhaten.common.items.registries.Materials;

import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.item.crafting.FurnaceRecipes;
import net.minecraftforge.fml.common.registry.GameRegistry;

public class SmeltingHandler {
	
	public static void registerSmeltingRecipes() {
		GameRegistry.addSmelting(Materials.silicate_clump, new ItemStack(Materials.silicate_ingot), 2);
		GameRegistry.addSmelting(Ores.rutile_ore, new ItemStack(Materials.raw_titanium), 3); // This smelting recipe doesn't work (Rutile Ore Block)
		GameRegistry.addSmelting(Materials.raw_titanium, new ItemStack(Materials.titanium_ingot), 3);
	}

}

EDIT: The method "registerSmeltingRecipes" is called in the preInit methods (FMLPreInitializationEvent)

Edited July 29, 2019 by Bertrahm
Forgot important info

[Draco18s]

29 minutes ago, Bertrahm said:

FMLPreInitializationEvent

This is too early, your items don't exist yet (probably).

[Bertrahm]

1 hour ago, Draco18s said:

This is too early, your items don't exist yet (probably).

I'm calling the registration method after the creation of my items and blocks, but regardless, which would be the propper method?

[Draco18s]

Show more of your code.

[Bertrahm]

My main class:

 

package com.linesix.akhaten;

import com.linesix.akhaten.common.blocks.ores.SmeltingHandler;
import com.linesix.akhaten.common.blocks.registries.BuildingBlocks;
import com.linesix.akhaten.common.blocks.registries.DimBlocks;
import com.linesix.akhaten.common.blocks.registries.MachineBlocks;
import com.linesix.akhaten.common.blocks.registries.Ores;
import com.linesix.akhaten.common.items.registries.Materials;
import com.linesix.akhaten.server.commands.Commands;
import com.linesix.akhaten.common.dimensions.Dimensions;
import com.linesix.akhaten.common.items.registries.Gadgets;
import com.linesix.akhaten.proxy.CommonProxy;
import com.linesix.akhaten.common.sound.SoundRegistry;
import com.linesix.akhaten.common.worldgen.OreGen;
import com.linesix.akhaten.common.Reference;
import net.minecraftforge.client.model.obj.OBJLoader;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.common.SidedProxy;
import net.minecraftforge.fml.common.event.FMLInitializationEvent;
import net.minecraftforge.fml.common.event.FMLPostInitializationEvent;
import net.minecraftforge.fml.common.event.FMLPreInitializationEvent;
import net.minecraftforge.fml.common.event.FMLServerStartingEvent;
import net.minecraftforge.fml.common.registry.GameRegistry;

import java.util.Random;

@Mod(modid = Reference.MODID, name = Reference.NAME, version = Reference.VERSION)
public class Akhaten {



   /*
    * Akhaten Public Beta (Version 0.5.2)
    * Copyright (C) 2019 Linesix Studios, Licensed under the ISC license
    *
    * Author: Felix Eckert (TheBertrahmPlays / Angry German)
    *
    */

    public static Random random = new Random();

    @Mod.Instance(Reference.MODID)
    public static Akhaten instance; // Create an instance of the main class

    @SidedProxy(clientSide = "com.linesix.akhaten.proxy.ClientProxy", serverSide = "com.linesix.akahten.proxy.CommonProxy")
    public static CommonProxy proxy; // Create a CommonProxy

    @Mod.EventHandler
    public void preInit(FMLPreInitializationEvent event) {

        Reference.logger.info("Entering PreInit phase...");

        //OBJLoader.INSTANCE.addDomain(Reference.MODID);

        // Register Items Blocks and Sounds Below
        SoundRegistry.init();
        DimBlocks.init();
        MachineBlocks.init();
        BuildingBlocks.init();
        Gadgets.init();
        Materials.init();
        Ores.init();
        SmeltingHandler.registerSmeltingRecipes();

    }
    
    @Mod.EventHandler
    public void init(FMLInitializationEvent event) {

        Reference.logger.info("Entering Init phase...");

        // Register Dimensions below
        Dimensions.registerDimensions();
        GameRegistry.registerWorldGenerator(new OreGen(), 0);

    }

    @Mod.EventHandler
    public void serverStarting(FMLServerStartingEvent event) { // This method just exists for registering commands

        // Register Commands Below
        Commands.register(event);

    }

    @Mod.EventHandler
    public void postInit(FMLPostInitializationEvent event) {

        Reference.logger.info("Entering PostInit phase...");

    }

}

  

 

[Draco18s]

You should be using the RegistryEvents to register your items, blocks, and so on.