The waypoints being missing in this legacy call is related to the issue introduced by Asobo here: Flight Plan Sync and GPS DRIVES NAV1. We have made them aware of the issue and our understanding is that they are working on a fix for SU3.
It hasn’t. The UI button is on the EFB, but the code to load the PLN is inside the sim, using the same C++ code path as before, with additional parsing. As such it is not clear to us why these SimConnect events are not firing, and we are still investigating. It may be related to changes made elsewhere in the sim by other teams for career mode, as the other teams made a number of changes regarding the legacy flight plan system unrelated to our limited EFB work; we would expect this event to be fired when one creates a flight plan on the world map by selecting an origin and destination as it does in 2020, but we do not see that event fire then either.
Thanks,
Matt