Profile Preview doesn't show up upon mouse hover

The profile preview I'm talking about is when you have your friends list on your right side of the client, and when you hover your mouse over a profile, it shows up a preview of them (mastery score, rank/level, champion background, icon). It doesn't fix after full restart as well, but sometimes it works, sometimes it doesn't. It seems like this bug showed up when the other majorly reported bugs showed up (previous and current patch, 9.12-9.13).
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