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Same problem, the mage stands in the passage and doesn't move. Moreover, on the second day, he appears there and doesn't move. It takes me about 3 days to get to that place; it's the second month, third week, fifth day, and that jerk hasn't moved from that spot even once.
Maybe someone else remembers how to get past it?!
Added after 1 hour 45 minutes
Figured it out :)
He leaves that spot for about 3 days somewhere near the end of the first week.