Trying to place a structure void block by right clicking an existing structure void block does not work.
This makes placing a large open area of structure void blocks difficult as you need to place solid blocks first, place the void blocks against them, then remove the solid blocks.
- For easy viewing of void blocks, place a save structure block with a decent sized volume and check the "show invisible blocks" option.
- Place a structure void block within the bounding box.
- Try to place another structure void block on top of the placed one.