Very simple and not really a big deal:
SGPro currently puts SCALE in the FITS header for the pixel scale. A lot of external solving engines (Astrometry.net, PinPoint, NOVAS, as a few) will look for PIXSCALE in the header to help determine the pixel scale for solving. This doesn’t matter to SGPro as it passes the scale to the solver directly (I believe). If others get an SGPro FITS image the solvers don’t have the pixel scale.
Anyway we could add PIXSCALE (or PIXSCALE1/PIXSCALE2 to follow standard axis speak) to the FITS header for SGPro in addition to the SCALE?
For instance, pass -g to Astrometry.net as additional command line, and it will read the pixel scale from the FITS header.