Bungie,
Twice tonight did the Legend Seraph bug out and not allow us to continue.
Right before the open room with Briggs.
Also, no crouch/rift function, which is really handy.
Nothing like wasting 2 hours for nothing, on an already endless grind of a game.
You own it - fix it.
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Quickest fix for no crouch is just swap out your class ability and set it back, a little easier than messing with keybinds. For the progression, I've found making sure all enemies are dead before shooting progression panels seems to prevent the issue so far.