Ray Traced Global Illumination is causing some materials to glow extremely bright
Disabling r.raytracing.globalillumination.denoiser fixes the issue
In 4.22 preview 5 binary (5365847) the result is black materials instead
May be related to issues reported with 4.22p5 ray tracing Forums
Result: Some materials start to glow overly brightly
Expected: Global Illumination turns on without any glaring defects
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-71554 in the post.