I really only need to know the image profile was Prophoto. I do see something that might need a slight tweak to force LCMS to do higher precision color conversions (full precision vs high precision). White seems to end up at 254,255,254 in some cases when using the faster "high precision" method. That might be what is causing a tiny color cast in white. Surprised you can even see a 1 RGB change near white but I suppose depending on the printer profile it could cause the printer to put a tiny amount of ink on the paper. I'll release a 2026.103 and we'll see if that fixes it.
Regards,
Mike