It’s definitely not all the way through. I’m thinking it’s an internal problem as well, unfortunately, because the egg is so long and it’s just that one spot that seems narrow. I like the idea of being able to salvage the egg, though!
I have a 2 year old Maran that has consistently laid these elongated eggs with a hole pushed in on almost the exact same spot everyday. She gets layer feed and has access to oyster shells. Any thoughts as to what’s causing this? Her eggs were normal last year!