I've just completed the DMT quest for the first time and stood around at the end for what seemed like an eternity. I got the update and went back to the tower but had no reward or further update from Zavala. Quite frustrating since I took my time and enjoyed the puzzles without a walkthrough, only to get to the end and not get the reward. I'm posting this with the hope that Bungie might take notice and be able to fix this bug in the future.