[Bug] Choral Mind encounter broken in "Encore" mission

[MULTIPASS]

Between boss phases, I ended up dying and re-spawned in a quadrant with a disabled teleporter and no vex mini-bosses to give me a blue key. I managed to coax a vex into teleporting onto my platform so I could escape, but now I am left with an active teleporter linking me to an empty platform and no key to get to the side that the boss is actually on. As far as I can tell, the encounter is completely ruined and THERE IS NOTHING I CAN DO EXCEPT START THE ENTIRE EXOTIC QUEST FROM THE BEGINNING BECAUSE THERE ARE NO CHECKPOINTS.

You can't fix every bug I get that, but put a ♥♥♥♥♥♥♥♥ checkpoint for exotic mission final bosses so this kind of thing doesn't happen.

Also, looking back through google for info on this issue revealed that this exotic mission was full of game-breaking bugs from the very start and somehow still is, wonderful.