If you are on a server and log off with a food item in your inventory, the creation date gets set to negative a bajillion when you log back in, causing it to rot. This does not happen when exiting to main menu and reloading a single-player save.

Did this occur after an extended period logged off? Or does it occur regardless of the time spend logged off?

Regardless of time logged off

I think this will be fixed by 7d972f9 - I'll reopen if not