Mastery undefined where champion rank for previous game should be
When game ends - where client tells you your grade (S/A/B/C), had 3 games in a row now where instead it's said 'mastery undefined'. Level 6 on Azir and my last game was definitely worth s/s+ so would have got a lvl 7 token. Can't find any common reason, have played 2 diff champs and it's on both.