[1.17.1] Ore Generation Not Working

[MakeItSimple]

Hello. I am trying to add custom ores. Everything seems to be called and executed (when print statements are added), but nothing changes in game. I had it working in 1.16, but not in 1.17. I changed some of it to work with the new forge version, and it compiles without errors, but nothing changes in game. Any help figuring this out is appreciated.

 

Code:

@Mod.EventBusSubscriber
public class OreGeneration {
	
	public static ImmutableList<TargetBlockState> ORE_TARGET_LIST;
	public static final ArrayList<ConfiguredFeature<?, ?>> overworldOres = new ArrayList<ConfiguredFeature<?, ?>>();

	public static void registerOres(){
		ORE_TARGET_LIST = ImmutableList.of(OreConfiguration.target(Predicates.NATURAL_STONE, Blocks.STONE.defaultBlockState()));
		overworldOres.add(register("tin_ore_block", Feature.ORE.configured(new OreConfiguration(ORE_TARGET_LIST, 5))
				.rangeUniform(VerticalAnchor.absolute(0), VerticalAnchor.absolute(48))
				.squared()
				.count(20)
		));
	}
	
	private static <FC extends FeatureConfiguration> ConfiguredFeature<FC, ?> register(String name, ConfiguredFeature<FC, ?> configuredFeature) {
		return Registry.register(BuiltinRegistries.CONFIGURED_FEATURE, new ResourceLocation(Extras.MODID, name), configuredFeature);
	}
	
	@SubscribeEvent(priority = EventPriority.HIGHEST)
	public static void registerBiomeModification(BiomeLoadingEvent event) {
		BiomeGenerationSettingsBuilder generation = event.getGeneration();
		for(ConfiguredFeature<?, ?> ore : overworldOres){
			if (ore != null) {
				generation.getFeatures(Decoration.UNDERGROUND_ORES).add(() -> {
					return ore;
				});
			}
		}
	}
}

[MakeItSimple]

I do that in my main class. I tested it with logger output and the event is called, but there are still no differences in game. I've already created the ore block, and that works, but it isn't generated underground.