Apologies if this has been discussed, I didn't see it in the first few pages. Earlier this morning I hopped into Shattered Ruin to get the eggs (and hopefully a nice drop from the chest, sure). I completed this Ascendant Challenge last time around and got the bones. I made my way through, say hello to Toland and complete that bounty. Got toward the top, shadow thrawl start pouring after me (as expected). Run around a moment, shooting and avoiding thrawl, waiting for the boss to spawn. When he appears I super him and hit him with a Telesto or two, dead boss. Thrawl stop spawning. No chest. No portal out. I wander around the top and get the eggs. Still no chest or portal. I drop back down to the bottom, talk to Toland and go back up. Part way up I hear the spawn again and find the thrawl and back and there's the boss again. I take it out as I did before, this time I got the chest and portal. Known bug? I'll run it again later today, going for the time trial triumph.