There's a mastery token bug when you reach level 5 mastery and get an S rank in the same game
When I got to level 5 mastery with Malphite, I got it at the same time I got an S rank and it said I got a token for it.
However when I checked my crafting tab, it wasn't there.
It was confusing to me since it told me such, but I just let it slide and not bother me too much.
However, now again this just happened to me moments ago getting a rank 5 mastery with Alistar and a S grade.
It told me I got the rank 5 mastery, then it told me I got a token as usual. So once again I checked and no alistar token was there.
This happening twice to me can be no coincidence.