UP2718Q, flickering after playing 60Hz white and black flicker test video

Hi,

I accidentally found a problem of the monitor. Play this video on YouTube for like 1 minute and turn off: https://www.youtube.com/watch?v=buLbnUAiFgQ

And after that at the same spot as the video was played, the screen will keep flickering. I tried to turn off the monitor, change to another signal input (showing it's not GPU's problem) or even unplug the power cable. The flicker will stay there, and it will disappear after around 10 minutes. I played the video on my other LCD screens, OLED screens, no flickering continued after turning off the video. I have never seen anything like this, usually LCD monitors don't have any trouble with flicker test. I'm not sure if it only happens on my monitor or all the UP2718Q model, does anyone know if there will be any permanent damage to the monitor?