The PS4 HDR update for The Witcher 3 unfortunately causes graphical problems. Players complain about unsightly pop-ups.
CD Projekt Red has recently released the HDR update for The Witcher 3: Wild Hunt on PlayStation 4 and PlayStation 4 Pro after a long wait, but players report that this has also caused problems with low visibility and pop-ups.
CD Projekt Red is aware of the problem:
I apologize for the inconvenience this situation causes. We are aware of this problem, and our development team is currently examining how we can tackle it. Right now, only changing the 4K resolution to a lower setting can help.