It is probably useless to report this since it is probably nearly impossible to recreate. Anyway, when I was trying to quickly finish CIB, I reached the room with the 3 minibosses. I got to Boss 3 and spammed the spell Teleport at Shade of Theorick. Suddenly, I was in a small enclosed room with two stacked single chests and some redstone, along with some invisible barriers (I know because I tried jumping around in the room). I did /kill to get out, and it worked. I wonder if anybody else has done this before? If not, this bug report can probably be disregarded as it is probably a very rare case of teleporting out of the map.