plustek opticfilm 8200i: gray scan not working

Hello

The support for the plustek opticfilm 8200i scanner is indicated as 
complete with the genesys backend, this is not the case.
I am using xsane 0.999 and sane 1.2.1 on Mageia9 distribution

As I pointed out in my message (copy below) dated July 31, 2023, the 
scan and preview do not work in grayscale mode.

I think this should be indicated on the dedicated page: 
http://www.sane-project.org/sane-mfgs.html

> Hello,
>
> *I don't speak English, so this text is from an automatic translation. *
>
> I am using xsane 0.999 and sane 1.1.1 on a Mageia8 or Mageia9 
> distribution with a Plustek OpticFilm 8200i scanner.
>
> If I scan color slides or black and white negatives in color mode 
> everything is ok.
>
> If I scan in gray mode, the scanner launches but it hangs at the end 
> of the scan, so I get no scan (same thing with the preview).
> I have to kill Xsane to close Xsane and restart Xsane to get the 
> scanner lamp back to its original position.
>
> Under windows the scanner works with the software delivered with it.
> Under linux the scanner works with the demo version of Vuescan.
>
> Thank you for looking into this problem, and I apologize if this 
> request is not made in the right place.
>
> Cordially.