Looks like there is an update on the forums for the Game mode HDR issue.
Might not be fixed (to anyone's surprise)
Second post down
https://us.community.samsung.com/t5/forums/v3_1/forumtopicpage/board-id/tv/page/2/thread-id/8587
Re: KS8000 Game Mode doesn't save settings for HDR/SDR
Hey guys, we finally got an update from our specialists. Game mode will usually bypass the DNIe chip in the TV and many picture options will be limited while using Game mode. So in essence, yes this particular issue is considered normal or a "feature" However, we are still looking into other issues with Game mode that I am sure you guys have seen across the boards and we will update those posts too as soon as we get further information.
Might not be fixed (to anyone's surprise)
Second post down
https://us.community.samsung.com/t5/forums/v3_1/forumtopicpage/board-id/tv/page/2/thread-id/8587
Re: KS8000 Game Mode doesn't save settings for HDR/SDR
Hey guys, we finally got an update from our specialists. Game mode will usually bypass the DNIe chip in the TV and many picture options will be limited while using Game mode. So in essence, yes this particular issue is considered normal or a "feature" However, we are still looking into other issues with Game mode that I am sure you guys have seen across the boards and we will update those posts too as soon as we get further information.