Arah Loophole.
Interesting find. I haven’t seen anyone doing this, but I’ve only run it three times.
FYI, in the game you can type /bug and report the bug while looking at the wall in question, and take a screenshot. There’s a little checkbox to report an exploitable bug, so make sure you check that.
This bug is all over the place on my server, too. The /vast/ majority of Arah exploration groups going require that you are willing to do this if you want to join. So far, I’ve only been able to get guild groups if I want to avoid exploiting this thing.
It has been reported multiple times, by multiple people, though- so I hope it is changed.
However, I don’t have much hope that the people who have been abusing it and showing others how to do so will get any sort of punishment. It is hugely widespread.