prismatic jelly

I have found the prismatic jelly. So only need to deliver and still have 3 days before the quests expired. But I save the game and was going to give to the wizard the next day. But the next day the Prismatic Jelly gone from my inventory and so is the quest. I’m so confused.

Stinking wizard wants these thing every seven seconds, but I don't know how to get it. Any help?

I killed the prismatic slime and got 2 prismatic jelly, now I'm stuck with an extra prismatic jelly. I can't eat it, I can't use it for anything, I can't give it to anyone and I can't throw it away.

I finally found a prismatic slime for the quest for the wizard, and after killing it, it dropped two prismatic slimes, probably because I was wearing the burglar's ring. I separated the stack, gave one to the wizard, took the other one back and... well, as title says. I cannot gift it (says...