Below, is a pic of a clutch that a female laid this morning. She double clutched and I was delighted with the size of this clutch.
She laid 12 days after shed, uneventfully and the vascular system was visible in some of the eggs.
I have raised hundreds of hognose eggs and all clutches had vascular structures when they were laid (including those that laid within 5 days)and I have a 95-98% healthy hatch rate.
Clearly, they are not being affected by a lack of oxygen and it is a non-issue - otherwise some clutches or at least some eggs would die.
Beyond the observable, all else is speculation.

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