Hello all,
I have completed the vials of eternity q on my old priest from tbc times and furthermore completed the rest of the black temple attunement chain. The last quest of the chain A distraction for Akuma which should hand me title was a bit buggy. It somehow completed though and I returned the quest at Xiri, but the Feast of Strength and the Title didnt unlock.
I checked on a wow quest completion site if i have completed vials q with the correct id from pre-Wotlk and it showed positive. So you can simply check that my priest completed it with the correct quest ID found on wowhead. (Nyni-Shattrath)