I'm trying to complete the Emergence quest step for the Xenophage. I didn't get get to all six orb locations before the timer expired. Tried to do it again, but now the orb has disappeared. I abandoned the quest and then reacquired it through the quest kiosk in the Tower. The orb will still not appear. I tried starting the quest all over on another character, but when I get to the Emergence quest step, the orb still won't appear. I think this might be a bug.