Weird Hole in egg. Not pecked/smashed/stomped.

[bobcrowson]

I have a chicken that just started laying eggs with holes in them. She has been laying for a while. The hole has thinned (feathered) egg shell progressing up to the hole, so it is not pecking / stepping damage. I am familiar with those. The membrane in the egg is intact. They are on egg layer pellets. Anyone know what causes and how to cure this????
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[bobcrowson]

Side view
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[aart]

Sometimes egg have thin spots, that's what this looks like to me..thin to incomplete.

How long have they been laying?
Probably a one off glitch....if it continues then might need to be concerned about a nutrition issue.

Not sure I've seen one like that before, should go in this thread for posterity:
https://www.backyardchickens.com/t/697007/weird-or-odd-eggs-pics