Yesterday I completed the new dungeon warlords ruin on master difficulty and once you beat it you can claim a triumph that gives you a ghost.
However the triumph doesn't contain a ghost but instead the exotic sparrow of ghost of the deep as shown in my link.
So I advice you to not complete this dungeon on master until it is fixed because the ghost is necessary for the title.
Edit : it seems every triumphs rewards are bugged in this dungeon and are giving ghost of the deep stuffs, I just did solo flawless and I got the basic ghost of the deep emblem instead of the solo flawless emblem
Have a nice day
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Hopefully one of these posts about the triumphs get traction. I mean I know it's the weekend but I've seen 6 other posts with 0 traction including my own lol.