SPIGOT-6220: Structures in the world with custom generator not work

By: DerFrZocker <derrieple@gmail.com>

paper-server/src/main/java/org/bukkit/craftbukkit/generator/CustomChunkGenerator.java

@@ -10,6 +10,8 @@ import net.minecraft.core.IRegistry;
 import net.minecraft.core.IRegistryCustom;
 import net.minecraft.server.level.RegionLimitedWorldAccess;
 import net.minecraft.server.level.WorldServer;
+import net.minecraft.util.random.WeightedRandomList;
+import net.minecraft.world.entity.EnumCreatureType;
 import net.minecraft.world.level.BlockColumn;
 import net.minecraft.world.level.GeneratorAccess;
 import net.minecraft.world.level.GeneratorAccessSeed;
@@ -18,6 +20,7 @@ import net.minecraft.world.level.LevelHeightAccessor;
 import net.minecraft.world.level.StructureManager;
 import net.minecraft.world.level.biome.BiomeBase;
 import net.minecraft.world.level.biome.BiomeManager;
+import net.minecraft.world.level.biome.BiomeSettingsMobs;
 import net.minecraft.world.level.biome.WorldChunkManager;
 import net.minecraft.world.level.block.ITileEntity;
 import net.minecraft.world.level.block.entity.TileEntity;
@@ -194,6 +197,11 @@ public class CustomChunkGenerator extends InternalChunkGenerator {
        return delegate.getBaseHeight(i, j, heightmap_type, levelheightaccessor);
     }
 
+    @Override
+    public WeightedRandomList<BiomeSettingsMobs.c> getMobsFor(BiomeBase biomebase, StructureManager structuremanager, EnumCreatureType enumcreaturetype, BlockPosition blockposition) {
+        return delegate.getMobsFor(biomebase, structuremanager, enumcreaturetype, blockposition);
+    }
+
     @Override
     public void addDecorations(RegionLimitedWorldAccess regionlimitedworldaccess, StructureManager structuremanager) {
         if (generator.shouldGenerateDecorations()) {