Cresteds don't usually have much of a yolk sack at all by the time they are ready to hatch, so it sounds like something wasn't right in the first place. It's possible it just ruptured when you slit the egg. I'm really not a big fan of sliceing eggs, but if you do it, do it quickly because there is a good chance you will damage something... especially coming in from the top. (manual extraction is also advisable in you're going to cut. afterall, what's another invasive procedure if you're already warmed up?)
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