Metahuman beard issue

Hi, i implemented metahuman to my chacter and his beard was fine in the beginning, but now its floating in editor and event not showing in game. Yes, i tried to force LODs to 0 or 1 and it does nothing.

Also i think i found the issue. In picture below, binding asset is empty. I look mustache and its binding asset was not empty and its works fine.
But when i tried to change binding asset of beard, it literally REJECTS changeing and returned instantly to being empty.
Probably a code that in somewhere makes it empty all the time but dont know how metahuman codes work.

What the hell happened here???