seems to be working fine, but trees and other decorations received massive bureaucratic payload

src/main/java/carpet/mixins/StructureFeatureMixin.java

@@ -102,10 +102,6 @@ public abstract class StructureFeatureMixin implements StructureFeatureInterface
 
     private StructureStart forceStructureStart(IWorld worldIn, ChunkGenerator <? extends ChunkGeneratorConfig > generator, Random rand, long packedChunkPos)
     {
-        if (2+1==3)
-        {
-            throw new RuntimeException("reimplement it");
-        }
         ChunkPos chunkpos = new ChunkPos(packedChunkPos);
         StructureStart structurestart;
 
@@ -120,7 +116,7 @@ public abstract class StructureFeatureMixin implements StructureFeatureInterface
                 return structurestart;
             }
         }
-        Biome biome_1 = Biomes.PLAINS;//  generator.getBiomeSource().getBiome((chunkpos.getStartX() + 9) >> 2, 0, (chunkpos.getStartZ() + 9) >> 2 );
+        Biome biome_1 = generator.getBiomeSource().getStoredBiome((chunkpos.getStartX() + 9) >> 2, 0, (chunkpos.getStartZ() + 9) >> 2 );
         StructureStart structurestart1 = getStructureStartFactory().create((StructureFeature)(Object)this, chunkpos.x, chunkpos.z, BlockBox.empty(),0,generator.getSeed());
         structurestart1.initialize(generator, ((ServerWorld)worldIn).getStructureManager() , chunkpos.x, chunkpos.z, biome_1);
         structurestart = structurestart1.hasChildren() ? structurestart1 : StructureStart.DEFAULT;