Vray denoiser, shadow catcher alpha artifacts

[markus_s_cg]

Hi,

In V-ray 4.02.04 when using the Vray denoiser and a V-ray shadow catcher object I get weird artifacts around my object (some sort of outline). What is the cause of this? Can I turn off denoiser for the render elements?

This scene consists of a box, a plane and a vray dome light (white), nothing more. It is rendered in the IPR renderer.

[markus_s_cg]

If I create a Vray sun the denoiser creates even stranger results in the alpha. The shadow goes from crisp to blurred.