Guild Wars 2

We were running this map like any normal fractal run, when we killed the raving asura bots and waiting for the chest and the ready option, the bots just flew up and the raving asura was gone. The option for the “ready” never shown up. I think we did something wrong with the run, but when we discussed what we did and what not, the only thing we agreed upon: that it was indeed a bug and we just ran the fractal run normally.
Can you please check if this is indeed a bug or there’s something wrong with how we ran the fractal…. (sorry we forgot to take a picture of what happened; we were just too sleepy and our minds were soup, visions blurry and we’ve very tired)

My party just had this bug too, after an hour of fractals and this being our last before Maw. We’re stuck here but finished the last boss.