I’m experiencing the same deficit. Thus far, I’ve completed the puzzle two times. The first time I was immediately kicked back to Lion’s Arch, the second time I caught a glimpse (in a fraction of a second) of the reward area and was then teleported to Lion’s Arch.
I’m not going to put any more time in this, as I’ve already wasted enough of my time on this silly jumping puzzle as it is… Thank you, santa claus.