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Trying to demarcate issue handling...

Thanks again, Iliah.

In the interim, and for the sake of progress, I will assume that the LibRaw library permits opening an X3F file from the indicated cameras, and provides Affinity the option to request linear or log brightness levels for each RGB channel, including the ability to not apply any demosaicing, sharpening or noise-removal.

That would explain how assembling a 'monochrome' image is entirely up to the raw developer.

In the only descriptive observation I have been able to obtain, Affinity indicated that

"...following one of your previous forum posts, and according to `LibRAW`, your images are colour images.". With no other elaboration, they have confirmed that they know exactly what the problem is.

I will ask Affinity to reach out again.
Much appreciated.