Two No Man's Sky Players Visit Same Planet at Same Time

Two No Man's Sky players have attempted and failed to meet up in No Man's Sky after one player happened upon a planet already discovered by another.
A thread on the No Man's Sky subreddit, as well as a Twitch live stream, show players thesadcactus and Psytokat coordinating to meet-up in front of the same NPC on the same planet's outpost. However, when the two appeared in the same location, they were unable to see each other.
The players also were in the same location at different points in