If any layer has metallic values enabled, that part of the color in diffuse map turns black on export. I've started multiple projects, different models, various presets for export, can't figure out why this is happening.
That is correct and the issue comes from mixing workflows.
In a Diffuse/Specular/Glossiness workflow, metal areas are black in the Diffuse map and any metal reflectance colour comes from the Specular map.
In a Basecolor/Metal/Roughness workflow, metal area reflectance colours are in the Basecolor map and metal areas are white in the Metalness map.
Work with either Diffuse/Specular/Gloss or Basecolor/Metal/Roughness. If you mix Diffuse with Metalness you lose the metal reflectance colour.
This guide explains the two workflows further :
https://substance3d.adobe.com/tutorials/courses/the-pbr-guide-part-2
Dave
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