Maya to xgen(groom) fur export UE5 rootUV error?!

Hi, I sent the fur that I made with maya (2018)xgen using the script of the Unreal official document, and connected the texture to the rootUV of “hair attribute”, but there was a problem as shown in the following picture. It looks like a mix of white fur. Is there a solution? Or is it a characteristic of Unreal?