From a recent exercise. It looks better with some dirt on it. I wonder what that patch of stuck-on camouflage pattern is for (on the side of the bustle). Possibly for IFF purposes?
It's to hide the turret number identifying the vehicle. They probably do it to screw with military enthusiasts who try to make sense of the PLA ORBAT using said numbers. It's completely unnecessary in this case since that tank is clearly from the 112th Division and the ORBAT of the 112th Division's armour assets is widespread knowledge among the PLA-watching community.