Display cases sells all group meals as single portions

Tried opening an internet café with the new Business & Hobbies expansion, every display case I put any cooked meals / baked goods with multi portions, gets sold as one sale.

Not realistic as I cant cook fast enough to keep up with demand, as sims buy all potions in one sale and not a single serve portion ... (Unlike the food stand which would sell customers 1 portion at a time)

No CC or Mods on PC