https://na.finalfantasyxiv.com/lodestone/topics/detail/d893f46b1f506a64b485295d29cf949ef43bf580
TL;DR sounds like there were some widely reported visual bugs related to texturing and lighting under some circumstances (notably character creator) which they’re going to patch up
Yup, have done that already but it only applies to the benchmark itself; if you go into the character editor after copying the file over it resets to one of the base hairstyles so you can’t edit your character with your desired hairstyle active if it’s not a base one.