Auto Attack Projectile registers but no damage on contact

This "bug"? has been happening ever since I started playing League of Legends several years ago, and I always took it as part of the game. But it doesn't happen too often, so I think that it would be easy to overlook from the developer team.

Normally, it happens when I'm csing, and causes me to miss a minion or 2 every several games, but in this clip it costs me the kill.

I'm not salty at all about it costing me the kill, but I just want to know if this is something that can be fixed, or am I just not kiting well enough, or can I chalk this up to desync/lag?