[GAMEPLAY] Brief game freeze when Lee Sin first appears on screen

I've noticed a recent issue where the first time an enemy Lee Sin appears on screen, the game briefly freezes.

This seems to been consistently repro'd in 5/5 games that had an enemy Lee Sin, with varying severity. The game normally freezes for a short time (~300 ms), but there was one instance where I placed a ward in a brush containing Lee Sin, and the game froze for about 1500 ms.

It may have to do with his Knockout skin, because he was using it 3/5 of the times it happened, but I don't recall whether he was using it in the other two.

Has anyone else experienced this?