No, sable X chocolate was done recently and produced nice looking animals with as far as I know no problems.
I think you are thinking of sable + spider which I've read is a fatal combo. Incidentally chocolate + spider is not fatal (I've got a chocolate pastel spider yb that is the fastest growing snake I've ever owned). The breeder who recently combined chocolate and sable indicated he thinks they are alleles (different versions of the same gene). The proof will be when those animals are grown up and bred but the chocolate sable does have a super sort of look.
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