[Client] Crafting Mastery 7

I just crafted my level 7 mastery tokens with Vi and the little pop up box then showed a purple gem and said that I just unlocked mastery level 6. I went to my profile, but there it does show that I have mastery level 7.

I don't know how to repeat this seeing as you only can do this once for each champ, but here's what happened:

1. Buy champion token thing from shop.
2. Go to crafting and disenchant 1 shako shard.
3. Use the champion token and disenchant the shard.
4. Craft the level 7 Vi mastery.

And that's when I saw it. I wish I had the presence of mind to take a screenshot.

Hope this helps.

PS This is on the new client.