[CLIENT] Mastery Tokens Upon Leveling Up

I was told by a Rioter in a Support Ticket to post this bug here.

After a long ranked game I managed to hit level 5 with Braum and in that same game I also received my first Mastery 6 token. I didn't pay it any mind because I wasn't playing Braum to hit level 7 but upon playing a few more games I got another token for Mastery 6 so before I logged off for bed I went to combine them and it turns out I was missing a token. Riot Support told me that I did not obtain two S- games but I am absolutely certain that I did so I am forwarding this bug here in hopes that it gets fixed and doesn't occur to anyone else.

Hope this helps, Noob3rt