cave air and void air block types ought to be falsy so complex block placing hexes continue to function in caves and near the void https://github.com/FallingColors/MoreIotas/blob/64d78ba161a7489f3cdfa8a3012791b41adac567/Common/src/main/java/ram/talia/moreiotas/api/casting/iota/ItemTypeIota.java#L76