I diid not expect that.

We bought a couple bags of the cat's preferred food, as we have to every two weeks or so. This time, she snubbed it.

It's the same brand, same food - but it does look somewhat darker in shade, so I will grant that there is some difference. But still! Miss Beatrice is incredibly food-motivated, so her suddenly being picky threw us for a loop.
We mixed up some porridge (i.e. dust from the freeze-dried food in warm water, making it gooshy) from the older batch which she eventually ate. I'm not sure what we're going to do.