I'm doing that quest at the moment. I was playing Gambit yesterday to get the 100% depositing motes and 10 victories and right after I got that 100% three other, unrelated, exotic quests all popped up on my screen and reset. Revision 7.2.2, Stasis Trigger and Points Piercing Forever. In all three I had done everything apart from the PVP aspect (because I hate PVP) but weirdly all three reset back to zero. Something is rotten in Bungie's servers right now and it's a big concern putting time into grinding out a quest if either that quest or unrelated quests don't update or worse, reset back to zero. They have a huge release on the horizon and some major issues with the game as it stands. Disconnections and network issues are one thing. Their servers losing track or deleting player progress is something else entirely.