After seeing the new achievement, I added all the r99 food items to my food wl. As I had already eaten 4 r99 items but didn't knew which ones, I wanted to delete those afterwards, but none showed the usual message "You have this item!". Manual account search on every item showed that Illouise has actually eaten the Sparkly Rainbow Pie, the Radioactive Pizza, the Grapesaur and the Chocolate Cake (food eaten page). I didn't delete these four items just yet in case we want to test.

Even more weird: I got Alegarten Stein Pumpkin on my food wl as I have it in my collection, but not given to Illouise yet. It is marked in my WL with the usual "You have this item!", BUT when I click on Account Search, it says it is nowhere to be found in my account although it clearly is in my pumpkin collection. This seems to be a problem rather with account search itself instead of wishlists though.

Sorry for the ping, but I remember that I had a similar issue with wardrobe items once; I think you asked me to test more but I shamefully lost the thread somewhere and couldn't (and still can't) find it anymore, and thus never did any additional testing. Is this related?

I don't think eaten foods show up on your WL like that... I think you're confusing that with when they added it to the Account Search feature itself. As for the Pumpkin Collection, I'm not sure that they added that to the Account Search at all.

I never thought about your first point actually... I just supposed that they'd show, just as read books do. Yes, you don't physically have that item in your account, but as soon as one of your pets has read a book, it shows up in your WL. It would definitely be nice if foods did that, too. About the Pumpkin collection: well then they should. You do even have that item, like you do when it's in your plushie, beanbag or sticker collection.