Dual sex chimerism is quite rare, but it does happen, where one person has an ovary and a testes. Usually one or the other is vestigial, but they are there. I don’t think you read either the paper referenced, nor this article particularly well.

Chimeras that are both male and female will normally form organisms where one is the endoderm (gonads, internal organs) and one is the ectoderm (skin, brain, nervous system). So those will not appear as anything but normal phenotypic males and females. But, they will be made of cells that are both sexes. To paraphrase you, “Deal with it. Die mad about it.”
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3418019/