I accidentally had dairy for the first time in years the other day for a similar reason. Local café. Ordered some tofu and a mocha with oat milk. Nothing else. Get my order, and the mocha has dairy whipped cream (the only kind they have). Nowhere on the menu does it say it comes with whipped cream. No one making it stopped and wondered “huh”. And I wasn’t even with anybody to pawn it off onto.

It is possible to commit no mistakes and still lose.