This past March the UA flight got cancelled and they put most of their F pax on SQ and CX (imo a nice upgrade!). Since UAs flight leaves in the afternoon, not sure why they didn't cater for a full cabin on the evening flights on CX. They ran out of just about everything and had to mix and match. They were quite apologetic as there was a couple who kept eating and asked for food from any cabin. They didn't care about the Krug as I think the FA was pouring the J cabin champagne to them.