The boss encounter with Captain Avarokk doesn't function correctly. The marauder and shank allies that normally accompany the boss do not spawn, Avarokk doesn't move nor shoot, and activating the scorch cannon devices do not properly drop the engrams as the pods that contain them do not open. I could not check whether or not DPS phase worked properly as it would take too long to reach it with only 1 or 2 engrams sneaking out of the closed pods on each activation.
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Yeah, this happened to me too on my first ever run (I've bought the 30th anniversary today). I managed to reached to the final boss encounter on my own and everything you said here happened to me too. I must add that, with some help of two friends in order to not restart the entire encounter all over again, when the damage phase starts, Avarokk is still immune to all damage and the damage phase is infinite (the growing crystal won't shrink to its initial state). In other words, the dungeon is atm impossible to complete and those within the first steps of the Ghallarhorn exotic quest, like myself, won't be able to complete it untill it's fixed.