Problem that HairWorks reflect light

We are creating a TrinityMS game using Unreal Engine 4.21 with GameWorks from Olento. We met a problem that HairWorks reflect light from point light. The hair makes everything around it much lighter when there is a point light. The problem doesn’t exist in UE4.19. But for creating the game we need to use UE 4.21 (or later) that makes hair to light.

Here is a video about this problem

Would appreciate greatly if you could help us to solve this problem.
Thank you
Octopus Entertainment LTD