Glad to hear this is still being worked on. Having gone down the Nvidia forums rabbit hole I've discovered that most of the problems with HDR originate entirely from Microsoft. Windows 10 is atrocious at handling HDR/DV and while Nvidia has attempted to mitigate the problem with driver updates there is very little they can do until Microsoft puts out improvements which at the earliest will be the October update. (Where they will hopefully release WDDM 2.5 and it won't suck like WDDM 2.4 did).
This is from an Nvidia developer on their forums:
"Windows 10 Creators Update HDR implementation overrides our HDR API so there is nothing we can do. Fine tuning of HDR on Windows 10 will come over time in future Windows Updates."
So a lot of game developers and even Nvidia themselves are finding themselves blindsided by having to work in the current Windows environment where an increasingly common element (HDR or Dolby Vision) is extremely unstable on the platform they are using. So I could totally see unexpected things happening like HDR turning on when it's not supposed to, HDR just plain failing with PCs plugged into fairly high end TVs, etc etc.
Not to make excuses for anyone, and those who purchased the game have every right to demand the product work (obvious statement of the day!), but I have to imagine some EA developers have spent quite a few hours banging their head against their keyboard over issues like these.
Hopefully a patch "fixing" the problem (likely just forcing HDR/DV into a disabled state but who knows) will be ready soon.