Bug in the mission \"Do not look down\" (Far Cry 4)

after the villis handed me over, a new mission began (do not look down), but I only have a black screen, while I can hear how I run and jump. not knowing what to do, I opened the map, saw that I was in "unknown territory" in the still undiscovered northern part of the kirat, and did a fast travel to the house of the gales. now there is no minimap, all weapons disappear with each new load of the game. however, I can run around the open part of the kirat.

How do I restart an interrupted mission?