That’s about where I got to as well. A proto-chicken’s egg that contains the genetic code for a chicken doesn’t become a chicken egg if I eat it first. At best, the creature has to have become a chicken before the surrounding egg can be described as a chicken egg, which means that the chicken has to come first (or simultaneously). The egg cannot come first.
I think it’s an egg laid by a chicken. Unfertilized eggs laid by chickens that will never become chickens are still chicken eggs.
That’s about where I got to as well. A proto-chicken’s egg that contains the genetic code for a chicken doesn’t become a chicken egg if I eat it first. At best, the creature has to have become a chicken before the surrounding egg can be described as a chicken egg, which means that the chicken has to come first (or simultaneously). The egg cannot come first.