Actually, looking it back up,the particular example I was thinking of, while possibly non-chimeric, was still mosaic with about 80%/20% 46,XY/45,X in the skin but ovaries 93% 46,XY; at any rate, the idea that biological sex is simple and binary is pretty clearly not true except in loose approximation.

https://academic.oup.com/jcem/article/93/1/182/2598461