3rd game breaking bug, I want to like this game but come on

Title. I've been having a ton of fun when the game works, but this is the 3rd time I've had a bug that forced me to either back track a ton of save data, or reinstall the game.

Literally just doing Norio's first quest, says to defeat the Mongols and they just don't attack. So I walk over and kill them. Nothing. No one moves. I can't leave the area without failing and restarting the checkpoint, which doesn't fix it.