Is it dishonest to sell yesterday’s bread without saying so, if it is still good?

In our bakery, yesterday's non is still good. A little drier, but perfectly fine, and many people warm it anyway. My mother-in-law puts it out with the fresh bread at the same price and says nothing. If a customer asks, she tells the truth. If not, not.

I was taught the hadith in which the Prophet put his hand into a pile of grain, found it wet underneath, and said that whoever cheats is not one of us. Al-Ghazālī, in the part of the Iḥyā' about earning a living, says a seller should not hide a defect in what she sells.

But is yesterday's bread defective? It is only older. Customers who buy in the morning assume it was baked that morning, I think. Is a false assumption that I did not create my responsibility?

I don't want to argue with my mother-in-law about this unless I'm right.