[1.7.10] Biomes are always registered with the biome dictionary?

Hi,

I'm trying to get BOP compatible mob spawning working and am having some trouble. Here's my code:

for (int i = 0; i < BiomeGenBase.getBiomeGenArray().length; i++) {
		BiomeGenBase biome = BiomeGenBase.getBiomeGenArray()[i];
		if (biome != null){
			if (BiomeDictionary.isBiomeOfType(biome, Type.END)) {
				EntityRegistry.addSpawn(EntityEnderSpider.class, 2, 1, 4, EnumCreatureType.monster, biome);
				EntityRegistry.addSpawn(EntityEnderTriplets.class, 1, 1, 4, EnumCreatureType.monster, biome);
				EntityRegistry.addSpawn(EntityEnderWatcher.class, 10, 4, 4, EnumCreatureType.monster, biome);
			} else if (BiomeDictionary.isBiomeOfType(biome, Type.NETHER)) {
				//EntityRegistry.addSpawn(EntityHellBat.class, 50, 1, 1, EnumCreatureType.monster, biome);
				EntityRegistry.addSpawn(EntityHellPig.class, 25, 5, 50, EnumCreatureType.creature, biome);
				EntityRegistry.addSpawn(EntityHellSpider.class, 50, 1, 1, EnumCreatureType.monster, biome);
				EntityRegistry.addSpawn(EntityScorcher.class, 7, 4, 4, EnumCreatureType.monster, biome);
				EntityRegistry.addSpawn(EntityWildfire.class, 50, 1, 1, EnumCreatureType.monster, biome);
			} else if(BiomeDictionary.isBiomeRegistered(biome)) {
				if (BiomeDictionary.isBiomeOfType(biome, Type.SNOWY)) {
					EntityRegistry.addSpawn(EntityGlacon.class, 30, 1, 1, EnumCreatureType.monster, biome);
					EntityRegistry.addSpawn(EntityFrost.class, 50, 1, 4, EnumCreatureType.monster, biome);
				}
				if (BiomeDictionary.isBiomeOfType(biome, Type.SANDY)) {
					EntityRegistry.addSpawn(EntityDesertCrawler.class, 50, 1, 4, EnumCreatureType.monster, biome);
					EntityRegistry.addSpawn(EntityAridWarrior.class, 35, 1, 4, EnumCreatureType.monster, biome);
				}
				if (BiomeDictionary.isBiomeOfType(biome, Type.OCEAN)) {
					EntityRegistry.addSpawn(EntityWhale.class, 1, 1, 1, EnumCreatureType.waterCreature, biome);
					EntityRegistry.addSpawn(EntityShark.class, 1, 1, 1, EnumCreatureType.waterCreature, biome);
				}
				if (BiomeDictionary.isBiomeOfType(biome, Type.BEACH)) {
					EntityRegistry.addSpawn(EntityCrab.class, 100, 4, 4, EnumCreatureType.monster, biome);
					EntityRegistry.addSpawn(EntityKingCrab.class, 40, 4, 4, EnumCreatureType.monster, biome);
				}
				if (BiomeDictionary.isBiomeOfType(biome, Type.JUNGLE)) {
					EntityRegistry.addSpawn(EntityJungleBat.class, 50, 1, 4, EnumCreatureType.monster, biome);
					EntityRegistry.addSpawn(EntityJungleDramcryx.class, 70, 1, 4, EnumCreatureType.monster, biome);
					EntityRegistry.addSpawn(EntityJungleSpider.class, 40, 1, 4, EnumCreatureType.monster, biome);
				}
				EntityRegistry.addSpawn(EntityCyclops.class, 2, 2, 4, EnumCreatureType.monster, biome);
				EntityRegistry.addSpawn(EntityMiner.class, 1, 1, 1, EnumCreatureType.monster, biome);
				EntityRegistry.addSpawn(EntityJackOMan.class, 1, 1, 1, EnumCreatureType.monster, biome);
				EntityRegistry.addSpawn(EntityCaveCrawler.class, 50, 2, 3, EnumCreatureType.monster, biome);
				EntityRegistry.addSpawn(EntityRotatick.class, 50, 3, 4, EnumCreatureType.monster, biome);
				EntityRegistry.addSpawn(EntityEnthralledDramcryx.class, 50, 3, 4, EnumCreatureType.monster, biome);
				EntityRegistry.addSpawn(EntityTheEye.class, 20, 1, 4, EnumCreatureType.monster, biome);
				EntityRegistry.addSpawn(EntityCaveclops.class, 50, 1, 4, EnumCreatureType.monster, biome);
				EntityRegistry.addSpawn(EntityEnderSpider.class, 2, 1, 4, EnumCreatureType.monster, biome);
				EntityRegistry.addSpawn(EntityRainbour.class, 2, 1, 1, EnumCreatureType.ambient, biome);
			}
		}
	}

I need to check if the biome only appears in the overworld somehow, since this is a dimension mod and I'd like it to be compatible with other dimension mods. However, BiomeDictionary has a

makeBestGuess

method, so

BiomeDictionary.isBiomeRegistered(biome)

is always true since the biomes are being registered with

makeBestGuess

. Does anyone know of a good alternative? Thanks!