Hello! I don't know why, but my block doesn't work in the game. It is registered in the game, but textures are unavailable and I can't place it. I can't find a mistake/////

Cusom Block class:

// CUSTOM BLOCK CLASS

public class CustomSaplingBlock extends SaplingBlock {
	
	private final TreeSpawner tree;

	public CustomSaplingBlock(Properties properties, TreeSpawner spawner) {
		super(null, properties);
		this.tree = spawner;
	}

	@Override
	public void placeTree(ServerWorld world, BlockPos pos, BlockState state, Random rand) {
		if (state.get(STAGE) == 0) {
			world.setBlockState(pos, state.cycleValue(STAGE), 4);
		}
		else {
			tree.spawn(world, world.getChunkProvider().getChunkGenerator(), pos, state, rand);
		}
	}
}

public abstract class TreeSpawner {
	@Nullable
	protected abstract Feature<IFeatureConfig> getFeature(Random random);
	
	@Nullable
	protected abstract IFeatureConfig getConfig(Random random);
	
	public boolean spawn(ISeedReader reader, ChunkGenerator generator, BlockPos pos, BlockState blockunder, Random random) {
		Feature<IFeatureConfig> tree = getFeature(random);
		if (tree == null) return false;
		
		IFeatureConfig config = getConfig(random);
		if (config == null) return false;
		
		reader.setBlockState(pos, Blocks.AIR.getDefaultState(), 4);
		if (tree.generate(reader, generator, random, pos, config)) {
			return true;
		}
		reader.setBlockState(pos, blockunder, 4);
		return false;
	}
}

BLOCK INIT:

	public static final RegistryObject<Block> EXAMPLE_SAPLING = BLOCKS.register("example_sapling", 
			() -> new CustomSaplingBlock(AbstractBlock.Properties.create(Material.LEAVES).sound(SoundType.PLANT)
					.hardnessAndResistance(0f).tickRandomly().notSolid(), null));

BLOCKSTATE (json):

{
    "variants": {
        "": { "model": "examplemod:block/example_sapling" }
    }
}

BLOCK MODEL:

{
    "parent": "block/cross",
    "textures": {
        "cross": "examplemod:block/example_sapling",
        "particle": "examplemod:block/example_sapling"
    }
}

Leaves and log are working perfectly. I think something is wrong with the model (?), but I think everything is right

you never use your custom TreeSpawner, you pass null when creating the RegistryObject