Serious plot bugs (The Witcher 3: Wild Hunt)

There was a certain problem when completing the task "Last Preparations", already at the last stage of completing the task, when you need to go to Avalak "hu in his room, he simply does not appear there.
I tried to go through all the curtains from a very distant save, but nothing happened, I also tried to meditate and complete tasks in a different way, but everything is even.