Why Doesnt 5.8 Metahuman Fingernails Change Color?

I migrated a UE 5.6 metahuman creator file into UE 5.8 hoping that the engine would convert the older creator file into the new version so that I could take advantage of the new fingernail and toenail coloring feature in the 5.8 metahuman creator.

I migrated and opened the metahuman creator file from UE 5.6 inside of UE 5.8 successfully, but when changing the material values for the fingernails, palms, and toenails, no change appears to happen on the MH model itself. Am I missing something? I tried switching on/off material overrides inside of the creator, but that doesn’t work either.

I can use the rest of metahuman creator’s functions just fine. It’s just the fingernail and toenail material that doesn’t seem to work. Any help appreciated.