I have noticed this sort of thing going on with Tesco ready made curries. I sometimes eat ready made curries on a Tuesday as I eat alone for logistical reasons. My wife is not a great fan of the ready made curries.
I can’t go into the details of how Tesco do naughty things with ready made curries because I am still ill and the naughtiness in question is very complex. You’ll just have to believe me.