No its not "newly crafted food"
As you can see the durability on this particular food is lowered, so its older food.
It happens to food both in and outside of the backpack, This case was in a canopy and in a bin.
It seems to be random, its not when its first created, I notice it sometimes when looking at the stats for the food to decide what to eat.
So this is me just randomly mousing over it, well after its been crafted AND moved into another bin.