I find instances on CR2, CR3, DNG, and Lossy DNG files. But I'm convinced it's a bug of some sort and a false positive. I'm not a Lightroom fan, but I tested it and found the same. If ACR reports a built-in profile, so does LR.
digitaldog, please hold off on using the raw images I posted. I'll look for a different non-person image and get back to you. I don't remember who that girl is and have no way to get permission.