Don't worry about the quest. If you have the Talisman in your inventory, you should be able to present it to the statue in the Shattered Throne.
When Forsaken initially released, there was no actual quest for Wish-Ender, players just had to figure it out on their own. The quest was added later to provide more guidance, but was never needed to actually get Wishender.
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Well the problem is that I had done the Talisman Quest but it didn't pop up in my inventory. That's why I'm worried about the quest; I know that it is a common problem that talisman won't show up after quest but if you have the "talisman presented" quest you are still able to show it to the statue. I did the Shattered Throne with my friend and I was the host. I couldn't interact with statue but he could. Still I have no idea what is happening.