Yes, it is an old bug. It is on Reni, isn't it?
The story of the quest is that you get ported to an area next to some Yasheedees with some of Morrok troupe, and then Barkud shows up. You are supposed to use two bombs in two circles. If you do it correctly, Barkud runs away, NPCs go back and quest completes.
If you do it wrong, not only can you not complete it, but that part of script gets stuck. Not just for you, for everyone. Barkud and NPCs are standing by, and nobody on server can complete it.
Yes, the quest is bugged and not resetting sometimes. And how often do you see that? As Shroom mentioned, it's been in the system since Limo was in the system. I been in that area with many alts, and tons of times with main back when this was endgame. It is a problem visible to everyone on the server or at least channel, yet I have only seen the problem one time. In other words, this is bleeping rare.
So, what do you think will happen when server is restarted for next maintenance?
-- Rustyx --- 92R / 92S / 92M on Reni (Guild KnightShift). Yes, running the new FOTM R/M, cause I am not elf enough to be WD/S.
Oh, and people who have more than 3 classes are clinically insane.