Are you still on the same job as you were for the one you completed the Bomb Queen guildhest on?

It's been so long that I don't remember how Guildhest unlocks work, but I do remember that their EXP bonus and completion is on a job by job basis. Just thinking, maybe you did the Queen one on a DPS, but switched to a different job like Tank or Healer, which you may not have done the bomb queen one on yet?

If that's not it, then I guess you wait on that bug report :/