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Forge 1.20.1 Custom entities not spawning


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I cannot get my custom entities to spawn naturally in the world. They spawn successfully from a spawn egg. I have tried a video and did what they said, but still doesn't work.


I put this in the entity's class:

 public static boolean canSpawn(EntityType<CarnAchillobator> entityType, ServerLevelAccessor levelAccessor, MobSpawnType mobSpawnType, BlockPos pos, RandomSource randomSource) {
        return Monster.checkMonsterSpawnRules(entityType, levelAccessor, mobSpawnType, pos, randomSource);


I this in the main class:

        public static void registerSpawnPlacementsEvent(@NotNull SpawnPlacementRegisterEvent event) {
            event.register(ModEntities.ACHILLOBATOR.get(), SpawnPlacements.Type.ON_GROUND, Heightmap.Types.WORLD_SURFACE, CarnAchillobator::canSpawn, SpawnPlacementRegisterEvent.Operation.AND);

In the modid/biome_modifier directory, spawn_achillobator.json file:

  "type": "forge:add_spawns",
  "biomes": [
  "spawners": {
    "type": "wilddinos:achillobator",
    "weight": 100,
    "minCount": 1,
    "maxCount": 1


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