Please note that we've updated the Mount & Blade II: Bannerlord save file system which requires you to take certain steps in order for your save files to be compatible with e1.7.1 and any later updates. You can find the instructions here.
Its hard to tell if you're trolling or being sarcastic or whatever. The whole point of the beta branch is for bugs to be ironed out. The stable branch is called that for a reason. Are you blaming the users for not testing the beta branch before playing?