The RotateTowards() method is called from Update() by AIPath and MineBotAI.
I think Time.fixedDeltaTime should be replaced by Time.deltaTime.
AIPath.cs(448) :
rot = Quaternion.Slerp (rot,toTarget,turningSpeed*Time.fixedDeltaTime);
to be replaced by :
rot = Quaternion.Slerp (rot,toTarget,turningSpeed*Time.deltaTime);
Without the correction, running the game at high FPS cause the agent to turn excessively and being jerky, and running at low FPS causes it to turn too slowly.