Visible light + Hair?

Hello

I’m having a strange issue with hair and volumetric or visible light in the standard renderer.  If I have hair on a character with volumetric light the hair becomes somewhat invisible.  If I turn of visible light it comes back to normal.
Is there some kind of incompatibility with the two?

See here
https://screenpresso.com/=VhE7b
https://screenpresso.com/=6p0Cc

Thanks!