G9 OLED ALT TAB Black screen any fix?

I've read that it is possible to fix the ALT TAB 3-5 Sec black screen with an HDMI 2.1 Cable.

Well I bought today one and it still black screens when ALT Tabbing out of Stalker. I have 240HZ with 10Bit Color set and Resolution ingame and on Desktop is the same.

Tried disabling Gsync no difference.

Is there a way to fix this or is this normal for Exclusive Fullscreen?