I would like to know I well. I've haven't started Act 2 for this reason. As far as I can tell, dialogue is not being played according to your progress. Act 1 had it fair amount of weirdness. Between that Dreaming City mission where all the NPCs would talk as if it was happening on the EDZ (you know, where the first anchor was) and the "replacement" for video calls in orbit either triggering late or being completely missable if you don't go to orbit in the first place. I even had Sloane dialogue, setting up the second to last quest step, play while returning to the HUB *after* I had completed that step. Don't know if Bungie reads the Lore forum for feedback of this kind but it feels very bad to play the game and have this feeling like things are not set up correctly.