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Found it! https://www.backyardchickens.com/threads/dropped-a-chick-while-removing-it-from-incubator.1319421/#post-21507699 I don't think that's the exact one I was remembering, but it mentions the same idea of keeping them in a bowl or cup to restrict movement.

I think I remember reading through a thread that mentioned putting the chick with yolk sack in a small bowl inside the incubator. I'm going to see if I can find it again and give you the link.