No performance grade showed after match

I noticed that in the past week, I often don't get any performance grade. The post game lobby doesn't show it: it keeps loading and loading, but it doesn't give a grade at all. I tried to check the match history, but they aren't showed there too. Now, this isn't a game changing bug, but I was really trying to get S for boxes and mastery tokens, but I can't receive them due to this issue

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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