My ex used to work an ice cream factory (Walls I think but not completely sure I remember right). She said she wouldn’t touch mint with a barge pole. Apparently, any wastage from other flavours was chucked in the mint one because mint is such a strong flavour it masks the other flavours.
On a brighter note, in between flavour changes on the equipment, they would spend a whole shift cleaning. For flavours marketed as allergy friendly, they would spend two shifts cleaning, so didn’t need to put “may contain traces of…”