I actually have a very similar issue going on with a brushed metal(anisotropic) material that I was testing. I’ve played with a million settings, none have worked. I don’t have hardware raytracing on this PC.
In this image, the left is with GI set to lumen, the right is set to none:
Here is the material in the editor, working correctly in the editor. The tangent material is a typical RG texture that I’ve used to test out plenty of anisotropic materials in the past:
