The yolk and stalk is still attached-so the snake was still absorbing nutrients. Of course you would not normally see this-and this would not be an issue if the egg was not cut. Manually manipulating it was/is the worst thing you could do.
You are lucky that it is pretty well developed at this point so even if it panicks and severs the yolk stalk it will probably do fine. If the hatchling stays calm it will absorb the remaining nutrition and break the connection normally.
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