Could it possibly be an old egg that went bad??? One that somehow got hidden in a nest somehow??? Are there more like this from that chicken??? Definitely DON'T EAT THAT GANGRENE.
BUT WISHING YOU BEST and
That's odd... the white looks fine and not old or bacteria infested... maybe a bad hiccup in the reproduction system, some shed lining of the tubes, perhaps?
I did toss as soon as I took a picture. It came from a young hen inside a egg a bit bigger than a fairy egg. She has been laying fairy eggs here and there. This was the largest she has laid. It looked as if there was organ material inside that sac. I don't have Roos so it can't be a fertilized egg. Strange!!!