Browser game freezes when I switch tabs

I can’t find a way to run browser games in another tab. The moment I change tabs the game freezes until I return to that tab again. The solution to this used to be disabling the flag “Calculate Window Occlusion On Windows” but it’s forever gone (you can’t even access to it using temporarily unexpire flags). Please notice that this has nothing to do with the options “continue running background apps when brave is closed” and the memory saver. I hope that anyone here can help me to resolve this problem, thanks!

@Niyon can you confirm your OS and Brave version? Thank you!