Attack Speed Debuffs Persisting Beyond the Round

Anyone else noticed this happening? I've had three games today where I had my champions affected by opposing Icy debuffs maintain said debuff through to the next round. Visually, they still had the Icy icon above them, and after double checking their attack speed, it was very much reduced still. I've lost two games to this!

Other players said, "Nah it's just a visual bug", but is it also a visual bug that their attack speed is lowered?

Swapping the champions around between rounds didn't seem to remove it, either. Super disappointed to have lost to bugs like this.