--- a/net/minecraft/resources/RegistryDataLoader.java
+++ b/net/minecraft/resources/RegistryDataLoader.java
@@ -74,7 +74,7 @@
 
 public class RegistryDataLoader {
     private static final Logger LOGGER = LogUtils.getLogger();
-    private static final Comparator<ResourceKey<?>> ERROR_KEY_COMPARATOR = Comparator.comparing(ResourceKey::registry).thenComparing(ResourceKey::location);
+    private static final Comparator<ResourceKey<?>> ERROR_KEY_COMPARATOR = Comparator.<ResourceKey<?>, ResourceLocation>comparing(ResourceKey::registry).thenComparing(ResourceKey::location); // Paper - decompile fix
     private static final RegistrationInfo NETWORK_REGISTRATION_INFO = new RegistrationInfo(Optional.empty(), Lifecycle.experimental());
     private static final Function<Optional<KnownPack>, RegistrationInfo> REGISTRATION_INFO_CACHE = Util.memoize(knownPacks -> {
         Lifecycle lifecycle = knownPacks.map(KnownPack::isVanilla).map(vanilla -> Lifecycle.stable()).orElse(Lifecycle.experimental());
@@ -238,13 +238,13 @@
     }
 
     private static <E> void loadElementFromResource(
-        WritableRegistry<E> registry, Decoder<E> decoder, RegistryOps<JsonElement> ops, ResourceKey<E> key, Resource resource, RegistrationInfo entryInfo
+        WritableRegistry<E> registry, Decoder<E> decoder, RegistryOps<JsonElement> ops, ResourceKey<E> key, Resource resource, RegistrationInfo entryInfo, io.papermc.paper.registry.data.util.Conversions conversions // Paper - pass conversions
     ) throws IOException {
         try (Reader reader = resource.openAsReader()) {
             JsonElement jsonElement = JsonParser.parseReader(reader);
             DataResult<E> dataResult = decoder.parse(ops, jsonElement);
             E object = dataResult.getOrThrow();
-            registry.register(key, object, entryInfo);
+            io.papermc.paper.registry.PaperRegistryListenerManager.INSTANCE.registerWithListeners(registry, key, object, entryInfo, conversions); // Paper - register with listeners
         }
     }
 
@@ -258,6 +258,7 @@
         FileToIdConverter fileToIdConverter = FileToIdConverter.registry(registry.key());
         RegistryOps<JsonElement> registryOps = RegistryOps.create(JsonOps.INSTANCE, infoGetter);
 
+        final io.papermc.paper.registry.data.util.Conversions conversions = new io.papermc.paper.registry.data.util.Conversions(infoGetter); // Paper - create conversions
         for (Entry<ResourceLocation, Resource> entry : fileToIdConverter.listMatchingResources(resourceManager).entrySet()) {
             ResourceLocation resourceLocation = entry.getKey();
             ResourceKey<E> resourceKey = ResourceKey.create(registry.key(), fileToIdConverter.fileToId(resourceLocation));
@@ -265,7 +266,7 @@
             RegistrationInfo registrationInfo = REGISTRATION_INFO_CACHE.apply(resource.knownPackInfo());
 
             try {
-                loadElementFromResource(registry, elementDecoder, registryOps, resourceKey, resource, registrationInfo);
+                loadElementFromResource(registry, elementDecoder, registryOps, resourceKey, resource, registrationInfo, conversions); // Paper - pass conversions
             } catch (Exception var14) {
                 errors.put(
                     resourceKey,
@@ -274,7 +275,8 @@
             }
         }
 
-        TagLoader.loadTagsForRegistry(resourceManager, registry);
+        io.papermc.paper.registry.PaperRegistryListenerManager.INSTANCE.runFreezeListeners(registry.key(), conversions); // Paper - run pre-freeze listeners
+        TagLoader.loadTagsForRegistry(resourceManager, registry, io.papermc.paper.plugin.lifecycle.event.registrar.ReloadableRegistrarEvent.Cause.INITIAL); // Paper - tag lifecycle - add cause
     }
 
     static <E> void loadContentsFromNetwork(
@@ -291,6 +293,7 @@
             RegistryOps<JsonElement> registryOps2 = RegistryOps.create(JsonOps.INSTANCE, infoGetter);
             FileToIdConverter fileToIdConverter = FileToIdConverter.registry(registry.key());
 
+            final io.papermc.paper.registry.data.util.Conversions conversions = new io.papermc.paper.registry.data.util.Conversions(infoGetter); // Paper - create conversions
             for (RegistrySynchronization.PackedRegistryEntry packedRegistryEntry : networkedRegistryData.elements) {
                 ResourceKey<E> resourceKey = ResourceKey.create(registry.key(), packedRegistryEntry.id());
                 Optional<Tag> optional = packedRegistryEntry.data();
@@ -309,7 +312,7 @@
 
                     try {
                         Resource resource = factory.getResourceOrThrow(resourceLocation);
-                        loadElementFromResource(registry, decoder, registryOps2, resourceKey, resource, NETWORK_REGISTRATION_INFO);
+                        loadElementFromResource(registry, decoder, registryOps2, resourceKey, resource, NETWORK_REGISTRATION_INFO, conversions); // Paper - pass conversions
                     } catch (Exception var17) {
                         loadingErrors.put(resourceKey, new IllegalStateException("Failed to parse local data", var17));
                     }
@@ -349,6 +352,7 @@
 
         RegistryDataLoader.Loader<T> create(Lifecycle lifecycle, Map<ResourceKey<?>, Exception> errors) {
             WritableRegistry<T> writableRegistry = new MappedRegistry<>(this.key, lifecycle);
+            io.papermc.paper.registry.PaperRegistryAccess.instance().registerRegistry(this.key, writableRegistry); // Paper - initialize API registry
             return new RegistryDataLoader.Loader<>(this, writableRegistry, errors);
         }