Hello, could it be possible to add a field in the FITS keyword. This field could be named ORIENT (for orientation) and be filled with:
UP-BOTTOM
or
BOTTOM-UP

Indeed, some software do not use the same read orientation, but the orientation is important for the debayer step.
Using this keyword could fix this issue if processing software start to read that.

I will add this in Siril if you're ok with that.