To replicate, try switching between the demos on https://developer.mozilla.org/en-US/docs/Web/CSS/perspective-origin . On other browsers, the perspective changes when toggling between the demos, on Safari the `perspective-origin` is changed but the layer is not repainted and the result stays the same.
I fixed this in https://trac.webkit.org/changeset/244612/webkit *** This bug has been marked as a duplicate of bug 197105 ***