I do not know if this is a bug or an intended feature, but if it is the latter it renders all food-focused businesses in the newest pack completely unviable.
In attempting to create a bakery today...
Ideas
This is happening to me, too! and I had a hard time separating stuff because my sim kept starting to eat it 😂 I assumed that they would just buy one serving, or pay for the whole thing. Even when I made the candy for this, someone picked up and paid for one cotton candy, but the whole tray disappeared.