I won't even try to guess what went wrong. This link might help shine light on the problem. But you'll probably never know what actually happened. DIS (dead in shell) are heartbreaking.it was in the correct position I think. It’s head was a little bit over the left wing though not under it. It looks like it did not internally pip, the membrane was intact. The yolk was not absorbed. I don’t see anything unusual. I will post pictures in the next post because they are graphic so if you don’t want to see scroll past the next post quickly. Any ideas what went wrong?
https://web.extension.illinois.edu/eggs/res24-00.html