Allows DatapackBuiltinEntriesProvider to datagen LevelStems (#9247)

src/main/java/net/minecraftforge/common/data/DatapackBuiltinEntriesProvider.java

@@ -64,7 +64,7 @@ public class DatapackBuiltinEntriesProvider extends RegistriesDatapackGenerator
     private static HolderLookup.Provider constructRegistries(HolderLookup.Provider original, RegistrySetBuilder datapackEntriesBuilder)
     {
         var builderKeys = new HashSet<>(datapackEntriesBuilder.getEntryKeys());
-        DataPackRegistriesHooks.getDataPackRegistries().stream().filter(data -> !builderKeys.contains(data.key())).forEach(data -> datapackEntriesBuilder.add(data.key(), context -> {}));
+        DataPackRegistriesHooks.getDataPackRegistriesWithDimensions().filter(data -> !builderKeys.contains(data.key())).forEach(data -> datapackEntriesBuilder.add(data.key(), context -> {}));
         return datapackEntriesBuilder.buildPatch(RegistryAccess.fromRegistryOfRegistries(BuiltInRegistries.REGISTRY), original);
     }
 }

src/main/java/net/minecraftforge/registries/DataPackRegistriesHooks.java

@@ -20,6 +20,7 @@ import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.stream.Stream;
 
 @ApiStatus.Internal
 public final class DataPackRegistriesHooks
@@ -64,6 +65,10 @@ public final class DataPackRegistriesHooks
         return DATA_PACK_REGISTRIES_VIEW;
     }
 
+    public static Stream<RegistryDataLoader.RegistryData<?>> getDataPackRegistriesWithDimensions() {
+        return Stream.concat(DATA_PACK_REGISTRIES_VIEW.stream(), RegistryDataLoader.DIMENSION_REGISTRIES.stream());
+    }
+
     /**
      * {@return An unmodifiable view of the set of synced non-vanilla datapack registry IDs}
      * Clients must have each of a server's synced datapack registries to be able to connect to that server;