Randomly while playing, the terrain goes blank for a second or so, flashes a purple & black with outlines of the terrain/area, and then it normally goes back to normal. In some cases, the game has to be restarted for everything to look normal again.
Have not been able to recreate it purposely, it does not matter how many people are playing or where you are.
Edit: Photos attached are from Playstation, PC & Switch players