Hello,
I am trying to use the material of paragon hair but I have an issue with it. I am using 4.26.
Here is a picture :
Here we are in an empty scene with juste UltraDynamicSky (not custom) and nothing else.
I just change the color of paragon sparrow material (in order to see the problem better).
As you can see, there is dark area that are quite strange.
I test several other character from paragon and it always have this strange thing.
The fact is I am trying to use the paragon material for my own hair (using my textures and the paragon material) and it works well but I always have this dark area…
Have you any idea of what can cause this ?
Thank you for your time 
All the best !