On Youtube, the browser window will always flicker (turn black for about 0.1 sec) when scrolling past the size of one page, but only if the video is loaded (so not when finished or if not started). It will also flicker when switching tabs, or switching and then scrolling, which also happens on other video sites, or just sites with embedded videos. But not if the video isn’t loaded of course. It’s not horrible, but it is annoying.
I confirmed that only the Brave window flickers (not other programs or desktop) and the behavior is not seen on other browsers. Extensions and second profile do not change anything. I’m on a Legion 5 laptop with a Ryzen 7 5800h and RTX 3060. Brave is:
Version 1.30.87 Chromium: 94.0.4606.71 (Official Build) (64-bit)