Structure blocks do not have a hitbox when you are not holding them, allowing you to place blocks in them or access doors and other things through them. This is a major problem as people who create maps and content in vanilla Minecraft use structure voids to restrict acess to things such as not allowing people to open doors or flip trapdoors.
See images below for example
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We're tracking this issue in MCPE-175237, so this ticket is being resolved and linked as a duplicate.
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