I had a DEN-EWR flight late last year or early this year, in F, in which catering failed to get to the plane. Weird that this happened on a hub-to-hub, but it was the only flight I can recall since beverages and snacks returned that actually missed. Personally, with that kind of ratio, in this dismal workforce environment (not just supply of people who will show up to work, but the quality of work that employers get), I chalk it up to "it happens".
Edit: I checked and this was mid-Jan, on a 752 with the 2/2 lie-flat config. We only had the snack boxes that Y had available for purchase.