As a temporary workaround to alleviate the flashing (inspired by UrbenLegend’s video): Turn off “Allow G-SYNC/G-SYNC Compatible” in the Nvidia Settings app → X Screen 0 → OpenGL Settings and set your game to windowed mode. Depending on the game, you might be able to get away with maximizing the window and hiding the title bar, etc.
Looking forward to a fix for this.