The Oracles questline

80 lvl Horde player.
There is a quest "Lost Mistwhisper Treasure", You take it from Mistcaller Soo - gan in Sholazar Basin. it requires You to retreive Mistwhisper Treasure ( a collectable item ) and kill Warlord Tartrek. The item is collectable but the problem is that the questgiver doesn't recognize that You have the item in your backpack. Questlog says, that the quest is completed but You can't complete the quest, because it says, that you didn't get the Treasure. Pls help i want that proto drake :D

Here's the screenshot:
https://drive.google.com/open?id=1JU...ecq2BK21uyB6va

Nvm, I tried some wariants of completing this quest, the solution is to kill the Warlord, but don't kill the Dragon that he's sitting on.

Pretty sure either relogging or abanding the quest and retaking it would've worked just fine.

I tried in many different ways, but I can't turn in the quest. I tried also in different days. There is an entry in the bugtracker but it's "uncomfirmed"