I have an LG OLED C9 television and when playing in 4K on my Xbox One X with the TV’s VRR port enabled the game client repeatedly resets the input over and over causing signal loss and a black blinking screen. Unfortunately it occurs so often that the game is unplayable in this state.
This doesn’t occur with the VRR port enabled on the PC JP version of PSO2 using the same TV.
In order to play, I had to go into my TVs picture settings and disable the VRR functionality on the HDMI port the Xbox is connected to. However, the Xbox One X now supports VRR as of a recent update.