Is there some kind of block protection going on in the End? Tried exploring it and mining some stone while dodging the dragon, but anything I mined popped right back, similar to normal lag but it doesn't happen in the overworld.
EDIT: Also I appear to be stuck in there, boss won't die and I don't have permission to warp anywhere -.-
EDIT 2: Figured I could get out by dying, so I jumped off the edge, but it places glass blocks beneath you before you can fall into the void xD
Managed to do it by stacking up blocks quickly before they can disappear and then falling from a height onto the glass. However while doing that I got kicked about 3 times for "flying" lulz.