Open an image, click on Color, then B&W, then Color Mix (Grey Mix), move the Red (or other color) to some value other than the default. Now copy the settings, restore the image to import, and finally paste the settings. You will see the Monochrome Profile is applied but the Grey Mix settings remain at the default, no adjustments are applied from Grey Mix. A preset that modifies Grey Mix also fails to apply the changed Grey Mix adjustments.