This is a known issue: https://answers.ea.com/t5/Bug-Reports/OPEN-Harvestables-disappearing-from-sims-inventory-and-chest/td-p/8417103
Were the missing items higher quality than Normal (if you can remember)?
Yes. I even shut down my game after a few hours of playing (and restocking everything) and the same thing happened again to all of the new inventory/items.
Same issue since latest patch.Mostly harvestables dissapearing from fridge after traveling. Lost death flower from my sim's inventory and some flowers stored in flower arranging table after sim traveling to another lot.
