[CLIENT] End of match grade not loading

I was super excited after seeing you could unlock chests by getting S performances. Well here I am, in this game (link provided) going 5-0-13 as leona support in a sub-30-minute game, and excited at the prospect of perhaps getting my first chest. However, when the game ends, the circle where your grade is supposed to show up is just not loading. I wait for a few minutes just to be sure, and subsequently give up because it shows no signs of loading. It's ok if I didn't get an S, I just wanted to know. It was pretty frustrating that the first time this has ever happened is the game where I felt like I could have had a shot at getting an S.

I'm not sure how to reproduce this bug, it just happened. The symptoms are the green circle where your grade is supposed to show up in gold letter just never loads and has two green cursors spinning around it forever.

I've only encountered this issue once and I've played since way before you guys implemented the match grade feature. Would love to see this issue fixed!