It seems HDR may be broken. Whether I have the box checked or unchecked nothing happens visually. I have a 42inch lg c5 and usually when a game supports hdr I get a little hdr logo indication that the game is using HDR.
However, I do not see any indication of HDR and no difference in visually quality when toggling the HDR check box.
GPU: AMD 9070XT latest drivers at this time (2.5.8.1)