I am using GPU RTX 3060Ti. Do you mean video playback resolution, or operating system resolution?
UPD: Tried changing the video resolution, tried changing the system resolution. The problem remains. Tried on other computers, the problem is the same.
Now I tried disabling hardware acceleration and it helped!
Now it turns out the browser works without hardware acceleration?
Will there be an update that will fix this issue?
UPD: I solved the problem myself:
I went to brave://flags/
Entered ANGLE in the search
I chose the DIRECTX 12 graphical backend
Now hardware acceleration in the browser works fine