A test mod for biome ID ordering issues in Minecraft Forge 1.16.3

BiomeIdOrderTest.java

package net.minecraftforge.debug.world;

import net.minecraft.world.biome.Biome;
import net.minecraft.world.biome.BiomeMaker;
import net.minecraftforge.event.RegistryEvent;
import net.minecraftforge.eventbus.api.SubscribeEvent;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.javafmlmod.FMLJavaModLoadingContext;
import net.minecraftforge.registries.DeferredRegister;
import net.minecraftforge.registries.ForgeRegistries;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

@Mod(BiomeIdOrderTest.MOD_ID)
public class BiomeIdOrderTest {
    public static final boolean ENABLED = true;
    public static final boolean REVERSED = false;
    static final String MOD_ID = "biome_id_order_test";
    public BiomeIdOrderTest() {
        if (ENABLED) FMLJavaModLoadingContext.get().getModEventBus().register(this);
    }

    @SubscribeEvent
    public void registerBiomes(RegistryEvent.Register<Biome> event) {
        if (REVERSED) {
            event.getRegistry().registerAll(BiomeMaker.func_244252_r().setRegistryName(MOD_ID, "first_biome"), BiomeMaker.func_244252_r().setRegistryName(MOD_ID, "second_biome"));
        } else {
            event.getRegistry().registerAll(BiomeMaker.func_244252_r().setRegistryName(MOD_ID, "second_biome"), BiomeMaker.func_244252_r().setRegistryName(MOD_ID, "first_biome"));
        }
    }
}