The bug
MC-106747 suggests that the structure void block is supposed to be a map making block only. Because of that I would expect it to have no hitbox in Survival mode and be unbreakable.
Linked issues
duplicates 1
Comments 1

MC-106747 suggests that the structure void block is supposed to be a map making block only. Because of that I would expect it to have no hitbox in Survival mode and be unbreakable.
marcono1234
(Unassigned)
Unconfirmed
break, structure_void
Minecraft 1.11
Retrieved
Dupe of MC-102908