Hi
For product shots I often use a HDRI with a (corona color) Shadowcatcher ground for the shadow on a plain background. Because of the great control of background color.
I noticed something strange, did some tests and it looks like the shadowcatcher mtl gives light??
I have no idea for how long this is, but it doesn't look good..
What are your thoughts on it, or does someone has a solution?
Attached a simple scene with a shadowcatcher ground, a basic corona mtl ground and my results.