Adding a less specific NB mapping when an included more specific SB exists leads to SB taking preference

If we have a mapping like 192.168.1.0/24 in stored in SB, with subscribers, a new NB mapping like 192.168.0.0/16 being added will not trigger a notification for the subscribers. In a NB first policy the less specific NB mapping takes precedence, and subscribers of the existing SB should be notified to update their mappings, including removal of the SB mapping.