Theoretically, this gender-linked feature can appear in cats with Clainfelter syndrome, when the genotype is not XY, but XXY. Indeed, unfortunately, I have no information about the presence of such cats (in humans, the syndrome is extremely rare, caseistic). and also about whether it is real to have a "turtle" colour in a cat XXU.

You are right! In cats, this sad syndrome is also manifested, also extremely rarely, and sometimes it is this three-colored color.