If the female for example was the het and not visual, she can have retained sperm from a previous breeding season or go through parthenogenesis(asexual reproduction).
This is what I was worried about in my previous post. There are cases where a clutch was sired by the current breeding male as well as the male used the previous season.
If any of this was the case, how would you know if your hatchlings were truly hets?
If the female was the visual, of course the offspring would be 100% hets.