this is an old problem still present :
- image developed in Affinity Photo beta 243 and passed to Persona Photo,
- Color Efex call by the filter menu,
- the image appears desaturated in the Color Efex window without filter actived.
ProPhotoRGB seems to be oversaturated in Affinity Photo (184.108.40.206) you can see my color profiles for the application and then a comparison of both Affinity Photo (top) and the correct display in Topaz Adjust when called as a Plugin.