has anyone encountered the level 25 THM class quest "The Hidden Chapter" with the final step NPC:Cocobuki not being able to interact with him?

if so how did you work around this problem or have you herd of a workaround? googling the quest shows it has been bugging out since October 2013 but yet i still see BLM's turning in their level 30 quests, and an FC mate got hers unlocked without encountering the bug.

any help would be appreciated.