Ok,Since there seems to be interest for this now I will repost.
(Also since you called Shenanigans lol)
This bug pertains to the gathering quests.If you play the game then you know that you must actually gather the rare item to complete the gathering quests.
Buying it from the trader will not work,nor already having it from before you got the quest.
Wrong.
If you borrow,buy or already have 3 of the item you can trick the game into thinking you just gathered it.What you need to do is open your bank and separate the item into 3 separate slots.
You then drag the item into your backpack,One at a time,Forming one stack.On your 3rd one you will then attain the Gathering Completed text.
You can now give back,sell or use the other 2 and go hand in the 3rd.
This actually works for the collect 20 quests as well.
Have fun getting your free exp and avoiding the crazy farming you would have otherwise needed.
Also lets not spread this around the web and keep it right here please.