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PSA You do not gain Champion Mastery in Vs. Friends games
Heads up, you DO NOT earn Mastery Points in Vs. Friend games, despite the Mastery announcement listing Vs. Friends in the applicable game modes.
https://playruneterra.com/en-us/news/game-updates/coming-in-patch-2-3-0-champion-mastery/
Went ahead and tested it with a friend. Lose, Win without summoning Champ, Win after summoning Champ, and Win after summoning and Leveling Champ. All games resulted in 0 Mastery. Switched to Vs. AI and Vs. Player (Norms) and started earning Mastery (With 3 champs in the deck, without summoing a champ, AI gave 60 and Norms gave 120). I figured that this would probably be the case due to Vs. Friend being abusable when it comes to rewards, but just figured that I would make a post about it.
Riot_DanCast
Hello, we're looking into this. Can you confirm your Friend game was *not* a Labs friend game?