Description of the issue:
Flashing (mostly grey) /flickering display when viewing Flash or Youtube videos on browser and Windows 10 GPU Scheduling enabled
Nvidia desktop GPU
could you go to brave://settings/system and turn off hardware acceleration
if it work fine then
do you have dual gpu like NVIDIA and intel if yes?
could you try to fix the gpu for brave there setting for that in your gpu setting try to find it
try to use the nvidie for brave and if it did not work try to use intel and ofcourse turn the hardware acceleration back on
just wanted to make it clear that i am not from the team i am just user same as you so my knowledge is limited so wait the team so they support you in better way