If crouch doesn’t work I’m afraid you will have to start new game. Also capturing the screenshot of the location is extremely helpful (e.g. location on the map, if it’s not obvious from the ingame screenshot)and describe if you did anything special so we can double check it and eliminate the possibility of players getting stuck in the future.
At the moment we can’t tell as the game is not fully optimized and better the rig doesn’t necessarily equal to better performance. And unfortunately there is no command in the Alpha to disable the NPCs :’( .