Useless denoiser in some case

[pavoda]

Hi,
denoiser makes some artefact/spots like big fireflies in some case. I think it is caused by glass (archglass) in windows. This is problem when rendered by GPU, on CPU render is ok. I think the clamp contribution settings is no effect with GPU and denoiser. I think it related with this issue

video report:
https://youtu.be/PfAZPByEIOY