I have already completed the Wish-Ender quest before on a different character, but I still had the old Dreaming Tokens in my Warlock's quest inventory. Even though Bungie said they removed them from people's inventory when they changed how the quest worked, mine were still there. I just tried to do the quest again to get rid of them, but after turning them into Waking Tokens, the Sjur Eido statue gives me a "Requires Purified Mementos" prompt instead of the "Collect Loot" prompt to finish the quest. This means it is completely impossible for me to get rid of the Tokens from my inventory.