I have tried replacing all the render settings from DefaultEngine.ini and it still looks the same.
I was able to replicate the black hair look in meta lighting project by forcing the hair parent material to use sm6 instead of dx12 which makes me think its possibly a shader issue.
my project is based on the city sample so DefaultEngine.ini for that is a bit of a nightmare to debug.
if anyone has any suggestions I’m open to trying anything at this point.