In my tests, this conversion works internally with linux. 
On windows it fails and stops at

l.63 \ registerctxluafile {data-bin} {}
                                  % before data-tex
?

El lun, 18 oct 2021 a las 10:49, Jason Ross (<jasonross1024@gmail.com>) escribió:


On 10/18/21 8:38 AM, Luis Montgomery wrote:
 > Check that your Inkscape is working properly.
 >
 > That proble NOT appear  on my machine...
 >
 > Best,
 >
 > L. Montgomery

(Sorry Luis, I forgot to cc mailing list)
Per https://wiki.contextgarden.net/Command/externalfigure,
in LMTX the conversion is done natively when "conversion=mp" is set.
Inkscape is not used for the conversion.