Not sure if this is meant as a part of the game or if it’s just a bug, but I found this earlier after just randomly trying just for fun.
You’re able to port inside QL by using the Thief’s “Infiltrators arrow” or the Mesmer’s “Blink” and most likely other classes’ teleport spells, on the top part of the cliff in QL.
So again, not sure if this is a part of the game or not. So if it isn’t then I suggest it beeing fixed as soon as possible before someone exploits it.