I'm seeing bread still fresh the following day quite a lot over the past few weeks.

I see a leftover from the previous day in my pack, I gobble it down to get rid of it, expecting to see it futilely attempt to poison me, and it actually works like it was fresh. Bread from scroll, item, high level spiritualist all the same result, still getting 203 from the bread 20 hours later. Sometimes it still tries to poison me, and I can't reproduce when it does and when it doesn't to my satisfaction, but I suspect its something like if its gobbled, the age isn't being checked properly to see if it has gone off.