Dark Souls 3 PC Steam version - Abyss Watchers bug

Ok, here’s the deal: some guy (maybe girl) summoned me to help him (or her) defeat the Abyss Watchers... But they suddenly decided to cosplay the Slenderman. FromSoftware, seriously, what the hack? Yesterday I saw immortal Crystal Sage, today – frozen Abyss Watchers ... Maybe tomorrow High Lord Wolnir will crawls AWAY from me or Deacons of the Deep will use HEALING miracles on me...