Roach reins become invisible during the mission "Blood Simple" in the Blood and Wine DLC. They disappeared as soon as you start investigating the area in search for the Alpha Garkain. They are invisible only in Toussaint: in every other regions you can regularly see them. As I mentioned before, the bug occurs as soon as you start investigating the area of the "La Compassion Orphanage" in the main quest Blood Simple. Until the cutscene where you arrive at the orphanage with Orianna, you can see the reins, as well as during the previous mission "The Night of Long Fangs". The reins disappear as soon as you regain control of Geralt after the cutscene between Orianna and the child in the Orphanage, and unfortunately they remains that way afterward. I've already rebuilt my PS4 database and I've also uninstalled and downloaded again the game. Nothing worked. Any help would be very appreciated as for me this bug is a real gamebreaker.