Thanks for getting back. From what I saw in the project the metallic texture was half white half black, which probably didn't map well to the objects in the scene. I did not have time to evaluate anything more than whether there was a valid bug to fix for us in the lighting team.
Please note that this channel of communication is for issues with the Unity Editor. If you're looking for help / support on authoring your projects, please head to the forums (https://forum.unity.com/forums/global-illumination.85) or our Discord (https://discord.gg/dAbvPYCN in #lighting) for more help from us (the developers) or our community.
I'd love to help more with the project, but it seems like the wrong way to go about it. Thanks again for submitting this bug to us!