Where's my token for mastery 6?

So I was playing Draft Mode with my friend because hes trying to get to level 30. I was playing Akali that game. By the end of the game, I got an S-. I also, got Mastery Level 5 with her. (Was Mastery level 4 prior to this.) Since I got Mastery 5 on her and getting an S-, I got a Mastery 6 Token for her too. So, I went into my Loots and Crafting Inventory and I saw no token. My friend said, the client is bugged so I restarted my client. I look back and nothing is there. This has happened to my Yasuo and Lucian when hitting Mastery 5 and getting an S, but no token in the inventory. Is this a bug?