I downloaded ilford ilfospeed and gallerie digital bw panchro paper fact sheets and it says :

Black and White prints can be made directly from colour
digital files although the results are often unsatisfactory
unless the file is first converted to greyscale. We would
therefore recommend colour files be converted to
Greyscale, prior to printing. The smaller files made by
discarding the colour information are also much quicker to
RIP and write. There is another advantage to doing this,
as some colour originals printed straight to Black & White
do not make suitable or interesting images without some
adjustment to their contrast or density.

If we can not print color image on panchro bw paper , what is the point of making panchro paper ?