I have Samyang 7.5mm MFT lens. Before buying affinity photo I specifically made sure the lens is supported.
Now one thing to point out is that this lens generally doesn't have electronic contacts so its usage will not be listed in the EXIF data. I haven't found a way to set the lens in the software and given your post it doesn't seem possible and there isn't even a plan to make it possible.
Can you please explain how you are claiming the lens as supported if I'm not able to set it manually given that this lens will never show up in the exif data due to its lack of electronic contacts? Is there a way to get this to work?