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I usually work on all of my image heavy layouts in RGB to have more control over the color editing in photos and then I export the PDF into a CMYK profile as I need it. I'm aware there's always a color shift from RGB to CMYK, this is just my workflow. Now a weird thing happens when I use Publisher and Photo together and when there are adjustment layers in my file. When exporting a PDF with a CMYK profile, all the image/pixel layers get converted to CMYK as I'd expect but everything changed by adjustment layers behaves differently. It looks like the adjustment layers return data from CMYK values instead of RGB values that are in the images. So what happens is that there's a very drastic color shift in the resulting PDF. The solution is to flatten all the adjustment layers and images. Which is tedious but I can do it, but as I understand PDF/X-1a:2003 standard that I use expects the images to be flattened anyway which is what I assume happens on export. I'm guessing the CMYK conversion happens before the adjustment layers are applied to the image (or maybe the adjustment layers aren't flattened with the pixel layers) and that's why there's such a dramatic color shift. If this is a bug, please fix it.

As I reported in this post for Affinity Photo 1.7.1 already, Affinity Photo (and Affinity Publisher) still completely ignore Live-Filters on PDF Export. Huge workflow killer.