Black foliage assets in shadow (Stationary skylight)

Hello!
I have got a strange problem with my foliage assets.
Some of them, not all (as you can on the screenshot), turns black in shadow.

My light setup:

Directional light, movable
Skylight, Stationary and built.
Lightmass importance volume set
Lightmaps set in every foliage asset, dimension for each asset : 8 to 16 pixel.

It’s really strange that this is affecting just some foliage.
Nothing seems work… ideas?

Thank you!

Hey RiccardoR,

This looks like it could be an issue with your shader/material being used with the foliage. Usually people use the Two-Sided foliage option which exposes the Subsurface Color input. That subsurface color in combination with the opacity input allows light to pass through your ‘leaves’ and produce a more realistic result.

Can you provide me with a screenshot of the shader you are using for your asset in question?

Thanks,