Yeah I think a lot of people don't understand shrink-wrapping.I also think shrink wrapping is most likely more complicated than it's often made out to be.
I've seen a lot of what I wouldn't actually consider shrink wrap being called shrink wrap as well. I personally only consider it truly shrink wrapped when the thick outer membrane shrinks around a chick, they really can't turn when that happens! I've seen a lot of chicks turn just fine when the inner membrane is a little dry (that membrane isn't nearly as tough even when dry).
The two worst cases of shrink wrap I've experienced happened when I hadn't opened the incubator during the hatch. The chicks made a very large external pip both times and the forced air fan was blowing close to or directly on them.
Wow that almost looks like an intestine! I would have though it was if I saw that! So glad to hear the little one was just fine.
I always snip the cord if it's still stuck as well, don't want the little ones pulling on their naval too much by dragging the shell around.
When my chicks hatch usually the membrane is dryish and white, but mine always have an easy time going through. I've never had a chick that can't get through the membrane when it's like that.
Maybe my dry hatching method completely prevents shrink wrapping because there's not enough moisture to even shrink wrap them.