Added a ##tag parser Pattern. gives a random combination using the blocks from the tag with an equal distribution.

worldedit-core/src/main/java/com/sk89q/worldedit/extent/world/ChunkLoadingExtent.java

@@ -63,6 +63,9 @@ public class ChunkLoadingExtent extends AbstractDelegateExtent {
     @Override
     public <B extends BlockStateHolder<B>> boolean setBlock(BlockVector3 location, B block) throws WorldEditException {
         world.checkLoadedChunk(location);
+        if (enabled) {
+            world.checkLoadedChunk(location);
+        }
         return super.setBlock(location, block);
     }
 }