Same here. It vanishes when I go through a loading screen.
I’m stuck in the same boat 
Hopefully they fix it sooner than later. I wonder what broke it?
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I have gotten the quest 5 times now. The only time it stayed was from the one DM to ZF (someone in party shared it w me when we started DM) but after the fight w the npc’s when the goblin blows up the door it disappeared yet again.
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yep, something to do with instance loading/traveling it keeps starting over. It also spams me when i start a new timewalker and asks me if i want the quest just to rub it in. I accept of course, but it never counts lol.
Tried about 3 times and quest keeps disappearing with no credit for dungeon. Great vault shows credit. Getting annoying, log, port or leave the area. Partner is having no issues, getting a bit maddening. This is happening on my lvl 80 main.