I also have this issue, I’ve also seen others mentioning it on other sniper maps and after thorough investigation, I believe this is caused by the leaderboards. The leaderboard for Siberia refuses to load for me and at the end of the mission I always get an error and am forced offline, losing all XP gain in the process permanently locking me at 14/20 mastery.
Platform: PS4
Location: Siberia
Steps to reproduce:
1: Start Hitman 3
2: Check Siberia leaderboards which don’t load
3: Play through the Siberia level (Silently or just shoot both targets, start the riot and sit there, results are the same)
4: Get an error as soon as your score should be shown on screen and forced into offline mode.
As you can see this issue isn’t just for a few players and seems rather major, yet hasn’t been mentioned at all so just wanted to repost it so it doesn’t end up under the radar.