Created another game session and did a GR135 and it got announced due to being faster than my previous GR135 clearance, and it was placed onto the Leaderboard (despite the fact that I cleared a GR136 earlier) so it’s only some of the game-hosting servers with the issue…
I had a look in Resource Monitor, to see which server IP addresses the game was connected to when it had a successful Leaderboard recoding…
