Leona Q Sion bug
When Sion is charging his Decimating Smash and leona uses her Shield of Daybreak on sion while channeling it gets interupted, but afterwards he is unable to use the Q (Decimating Smash) again for the rest of the game until the summoner relogs.
The icon is not on cooldown. Instead it says its ready even if 2 minutes pass by it says its ready to use, but you're unable to use it because it says its on cooldown.