Minimum Charging Level

The App allows us to select a minimum level of charge upon arrival at a charging station and my understanding is that the navigation system will determine charging stops from this setting and with Enode data, update charging stops as we go. On my extended road trip yesterday, the system displayed charge level at the next charging stop lower than my set point of 20%, however the navigation system didn't update to show a closer charging station. I feel this could result in running out of power in between charging stops (which could result from weather changes such as changing head winds).

Should the Premium version update charging stations as we drive if the navigation systems reaches an estimated charge level below the set point? If so, what settings do I make to ensure this functions?