@MojangSupport Hey I tried to use Structure Blocks to remove the bottom of the end island, Minecraft kept crashing and now I can't remove the Structure and Command blocks. Like I can but once I exit and get back in the blocks are back in the exact same spot.

Gonna be honest here and say i'm not sure structure blocks is? If I had to go out on a limb I would say its a third party mod but can you please clarify a bti more for me. ^TK

Ya structure blocks are in vanilla and you can only get them from commands