Hi there, I'm new! My DH and I have seen something similar on a very large chick of ours that just hatched, after needing some assistance. It had pipped early Friday afternoon, started to zip late Friday night, then seemed unable to reposition itself for over 24 hours.
It's banding around inside the incubator now, peeping its head off, but it seems to have a large air or fluid filled bubble at the base of its neck, kind of over its right shoulder.
Is this something to be concerned about, or could we expect it to go away on its own?