Landscape layer blend do not use emissive channel?

Hello everyone!
i am making a terrain material using 3 material functions. everything looks correct but the emissive color channel.
One of my functions is a snow, and i am using the emissive channel to add litles bright dots sparking here and there.

The thing is everything is mixed in the landscape layer blend, but the emissive do not give any information. I tested adding flat color emissives on the other functions aswell, but no joy. looks like the emissive information is not used in the layer blend.
Any idea about this?