Barrens quest from npc at the crossroads, quest name APOTHECARY ZAMAH. You are to bring Zamah the Rendered Spores item you receive from the quest giver and take them to Zamah who is located in Thunder Bluff.
There is a timer on the item Rendered Spores that’s visible on the tooltip, however there also appears to be a hidden timer on the server end that’s NOT visible. The item timer stops while you are offline, the server timer does NOT pause while you are online so what happens is if you log out the quest will be marked as FAILED in the quest log when the hidden timer expires even though there will be plenty of time left on the visible timer on the item.
Confusing and likely a bug, maybe it was bugged in vanilla also, who knows, I’m reporting it.
EDIT:
Ahh yes, there ARE two timers and they are actually both visible. One uses the QUEST TIMER UI, the other timer is on the ITEM ITSELF and those two timers can desync from each other. I had logged off earlier so the quest timer continued to run and expired thus marking the quest as failed. I had 8 minutes left on the Rendered Spores item when I accepted the quest again however the item you get, the Rendered Spores did NOT get any time added to it.
So I ended up with a quest timer ui of 45 minutes and an item timer of 8 minutes. And when the item timer ran out it disappeared from my bags even though there was still time left on the quest ui. Thus making the quest impossible to turn in.
This is likely a bug, the quest item time needs to be updated when you reacquire a failed timed quest like this so the two timers are in sync with one another.