the true riot's way to fix things
if an ability is bugged and doesn't work like its tooltip says it should, you change the tooltip:
Phroxz0n commenting on the Azir E tooltip change today, explaining there is no gameplay change due to a bug and noting that bug has been around since at least August: "For Azir, there's been a bug on live for a while where the bonus health scaling from Azir's E hasn't been getting added to the shield. Instead of adding this functionality, we've decided to remove it from the ability."