HDR doesn't work properly

When enabling HDR in Horizon 4 the picture is washed out, colors are greyer, even if the setting is enabled prior to booting the game.
If I activate HDR in Windows10, but leaves HDR OFF in game, its the opposite, picture is blown-out, brightness is way too high and color are over saturated.
It never worked properly, it has been that way since release.

HDR works perfectly in Forza 7
Nvidia control panel set to YCC 4:2:2 limited, tried both 10 and 12bit settings
Windows10 HDR mode on
Playing on a LG OLED

Please look into it
Thank you

Please submit a ticket and attach screenshots if you can

Thanks.