Sky mask in Lightroom Classic includes the horses white facial markings in the mask if the horse is silhouetted against the sky.

I have version 15.5.1, the latest version.  When I mask the sky on a photo like this it will mask the white park of the horses blaze as part of the sky.  I then have to subtract the object or subject.  The subject masking sometimes makes a similar error and skips the blaze.