GGPO has an interesting flaw in 3d games with prediction. In 2d games GGPO is like "we'll predict you just keep holding the buttons you last were holding", but that breaks since the "buttons" in 3d games also include the camera, which moves on it's own (if you're locked on, say).

For Honor apparently uses rollback with 3d tho, so i'll have to figure out how they fixed this problem.