I am also having this ugly halo effect when I have hdr on my ks8000 Samsung 55 inch with 4k/hdr. The battlefront opening logo has a bad halo, the menu screen has background black color bleeding, the loading screen background has halo effect around objects and the campaign cutscenes do not handle black color background well. The in engine gameplay looks perfect. I had this issue with the beta and the problem is still there now. I never have issues with blacks when hdr is on with any other game or movie.
EA please fix this, change the progression system without loot boxes being so entangled into the level design and only return loot boxes for cosmetics. Matter of fact, get rid of loot boxes and allow people to pay from exactly the outfits etc that they want and not by chance.