It could be from one of the short term challenges. Maybe Growfruit or the Forbidden Fruit. in the newest PlantSim challenge.
I have a Perfect Growfruit tree in the gallery under user name EuphorialQueen or #EQCreations if you need it to complete your collection. 🙂
I'm currently having this same issue, although I've tried both the grow fruit and the forbidden fruit and neither of them worked. This is the one I'm missing.
I wonder if that is the Forbidden Fruit of the PlantSim challenge.
I used bb.showhiddenobjects true to get the forbidden fruit and it didn't fill the spot, I don't think the forbidden fruit is a part of the collection.
It is though, did you place it in your Sims inventory? (my game is Dutch, but it says 'Forbidden Fruit of the Plantsim')
