I feel like this is a troll... When you went into creative to switch you aimed at the top of the block and you could see the black lines around the block. But when you went down to the bit where you couldent break through and when you went to the veiw of your player in survival you couldent see the black lines either...
Im sure this is a troll... Every time you you can't break it there is no black box around the block. Schematics please.
I'm not a troll though, that was an error I had with my old system of creating it, it has been fixed now.
It uses a glitch which affects only single levels, with some alterations you can make it multipile stories