linked terrain chunk min height support

src/main/java/com/volmit/iris/util/LinkedTerrainChunk.java

@@ -122,6 +122,11 @@ public class LinkedTerrainChunk implements TerrainChunk
 		biome3D.setBiome(x, y, z, bio);
 	}
 
+	@Override
+	public int getMinHeight() {
+		return rawChunkData.getMinHeight();
+	}
+
 	@Override
 	public int getMaxHeight()
 	{