I already have entities spawning in my biome.
this.addSpawn(EntityClassification.CREATURE, new SpawnListEntry(EntityType.CHICKEN, 50, 1, 10));
this.addSpawn(EntityClassification.CREATURE, new SpawnListEntry(EntityType.COW, 50, 1, 10));
this.addSpawn(EntityClassification.CREATURE, new SpawnListEntry(EntityType.PIG, 50, 1, 10));
this.addSpawn(EntityClassification.CREATURE, new SpawnListEntry(EntityType.SHEEP, 50, 1, 10));
and when I set the surface block to generate as grass they spawn, but when it's my block they don't.