Experimental Features are on.
When I set a structure loading block and hide its bounding box, it does hide it, but when you exit the game and come back, it doesn’t hide it anymore. When you go to the structure block, it says that it’s bounds are off and when you leave it, it hides itself immediately.
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We're already tracking this issue at MCPE-50739, so I will resolve and link this ticket as a duplicate.
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There's also a chance of it occurring when you go far away and come back. I quick fix is simply opening and closing the GUI. I know, shouldn't have to do this but I'd rather not destroy them. Hopefully, they fix it soon.