Aww. Yeah never help a chick hatch. Some take 48 hrs to hatch. We may think they are 21 days but it doesn’t hurt to let em keep incubating past 21 days. I don’t know if it will survive but I would still be hopeful but definitely don’t help more chicks in the future, they all know what to do.
There are some instances where assisted hatching is necessary.
I’ve assisted a few and they all turned out fine.