Last weekend I was doing the Gjallarhorn catalyst with a fireteam of three. Did everything until the 3rd Vandal and chest. Actually I did a also one trial run with the riches but I was a bit too slow to deploy them in time at the chest. And now we come to the big mistake I did... As I was already running a bit late for something else I wished good night to the rest of the fireteam at the same time thinking to come back next day to complete the things with the 3rd chest by using the check point. Well, the next day when I returned - blam! - no chest nor the 3rd vandal, no catalyst! Bug or 'feature'?!?