Assassin’s Creed Valhalla dealing with some crashing issues since the release of the Title Update 1.2.0. While there is no permanent solution yet, the development team at Ubisoft have come up with a temporary fix. This new hotfix has removed certain items and quests that contribute to the problem. Hopefully, this should let you experience Ravensthorpe without getting “desynchronized.”
It appears settlement decorations are behind the crashes, so those have been removed from the game, along with quests for the Ostara Festival that involves those items. Once a permanent solution is released, these items should be back in the game. Ubisoft set a timeframe of “sometime next week” for the larger fix.
While this issue hasn’t been in the game long, you may not have even encountered it. Obviously, enough players have dealt with it for Ubisoft to take notice and fix it as soon as possible.