From the frying pan into the fire.

To be more precise, the crash occurs after the cinematic that follows the victory; there is no save before the battle, but I killed him outside the Castle without any crashes (Hero difficulty), so the mission is completed

Added 5 minutes later
And yes, thank you for another impressively pleasant piece of work

Added 3 minutes later
I downloaded the map yesterday or maybe the day before, it was an updated version I think