10 bit color in recent updates not working.

I don't know if I am doing something wrong of if AMD just broke 10 bit color on their recent updates.  Up until 17.7.2 I was able to pick 10 bit color when running 4k 24hz or 4k 30hz, only 8 bit with 4k 60hz.  This setting was in the old portion of Radeon settings.  With 17.7.2 (maybe earlier but I didn't update) this feature was moved under display in the main Radeon settings.  I don't mind the move, but now when I try and pick 10bpc while in 24 or 30hz it just goes back to 8bpc.  Why is this happening.  Obviously my card and TV can both use 10 bit at these resolutions as I have been using it for over a year.  But now it doesn't work.  FYI, I am now running the newest 17.8.1 and this issue still occurs.  Further info on my system is I am running a R9 390 with an active DP>HDMI 2 adapter to my receiver (all HDMI 2.0 ports) to my 4k TV (1 HDMI 2.0 port, using this one).  This has to be an issue with Radeon as no other changes were made other then updating software/drivers.  I marked this as a question though it isn't really, unless someone has an answer as to something I may have missed or done wrong.  Thanks.