OK, I’m going to file a bug report & reference this thread. Since @RickToTheMax mentions ^^above^^ that it was also in the SU2 beta, I’ll file it in Bug Reporting Hub > ATC, Traffic & NAVAIDs rather than in the SU3 category. I’ll post a link in this topic once created.
@DementedCorn327
True, though the event is hosted both for 2020 & 2024, it could be that no-one participating on 2024 was in the SU3 beta. I did change my server to the SE Asia server, as indicated in the event topic (here).
I’ve been looking for multiplayer traffic in the SU3 beta in the world map for about a week, checking common locations such as Tokyo (where users in SU3 have been flying), LA, London, etc. & have not seen a single multiplayer aircraft.