It's easy it has super black pastel in it, which , means they are prone to deformities.
Some are successfully hatched here and there and some breeders have tried and after they fail (severely difforme hatchlings) have decided not to persue that project anymore, like the Caramel Albino. When something has more failure than success it is not viable market wise or as a project.
The good news is that there is hope for a issue free black and white BP IMO but it will not be using a super black pastel but another morph that is very much underrated.