Eggs look collapsing? (Gonometa nysa)

Hi all,
I've noticed that my eggs from Gonometa nysa are 'collapsing' (see picture). The dent is visible at the micropyle.
Does this mean that the eggs were infertile, or is this a sign of developping catterpillars inside?
Thanks for replying if you have experience with this phenomenon.

Kind regards, Arent

Eggs turned brown. I opened one today and there was noting in it. Seems the eggs were infertile. Better luck next time.