Hello there,
I believe this may be an error in HairStrandsInterpolation.usf that sets [WaveSize(32)] without correctly checking the minimum wave size supported by the hardware. This should be fixed upstream in CL 37239582 (Git: e5984ed86f37477ec20dc8372a417a056d0ed2cb).
This may lead to grooms costing more on those platforms are WaveOps will be disabled.
I hope that helps.
Best regards,
Chris