My second batch I definitely lost one because I opened the bator and humidity dropped. I wouldn't call it totally shrink wrapped, but what happened is the membrane dried out right at the pip hole. When I did the eggtopsy, the entire chick wasn't wrapped, but the dried membrane at the pip hole had stuck to its beak, and it could no longer turn itself to keep working. The next batch was when I left them alone until the hatch was over, and just did the same again. 22/23 and 18/20