Tristan quest - Casting Off the Veil - bugged

[bigdanhere]

I'm doing Tristan's companion quest, Casting Off the Veil, and I've hit a roadblock.  I've reached the part in the quest where I'm supposed to "Wait to Hear from Virgil" and Tristan has completely disappeared from the Incognito ship.  He's nowhere to be found and I'm unable to progress the quest.

At first I thought the issue might resolve itself or that perhaps I just needed to complete some other quests first.  But now I'm literally at the last mission in the main story and I've completed all others side content as well.  Anyone else have this issue or have a way to resolve it?