Not sure if I quite understand the question, but from a HA perspective, both sensors in the pair share exactly the same info (via the interconnect link). All TCP flow and state information is shared between both sensors.
If one side of the link goes down, the other sensor is able to pick up where the first sensor left off without any issue. There is no need to notify the sensor which link is active and which link is not. With the interconnect link, both sensors act as one.
Thanks for your answer.