Ok after doing some more work on the project, I noticed that when hiding (with the eye icon) all but the hair and the head texture set, the problem goes away as well. My suspicion is that this might be some optimization thing Substance is doing or something else related to that, the scene has about 150 objects and 42 4k…
Also one thing that I can say for sure, for anyone else who encounters this issue, it's not related to any specific layer, it's something related to Substance's engine or device it's running on. I don't seem to have the issue anymore, but wasn't able to pinpoint why excatly it's gone, it seems quite elusive. I'll keep the…
Thanks for replying. - Base Surface > Specualr Quality > Ver High (128) doesn't fix it - Switching HDRI to one of SP's default HDRIs doesn't fix it - The scene is setup for PBR workflow. Project config is: OpenGL and Color Configuration of OpenColorIO with Substance config (defaulting this also doesn't fix it). The shader…