J-Gang

I resolved this by merging (or flattening) the layers in my Photo docs and saving them out as PSDs. The PDF then wrote correctly. I don't know if this is the correct method, but it's a janky workaround and not efficient. It seems that Publisher was reading the affinity Photo file with the lowest layer active, and not including all of the top layers. Strange. Don't know if this behavior would exist if I just used PSD file formats instead.