Ezreal True Shot Barrage not being interrupted

This isn't a bug.

Ezreal's ultimate is not a channel like Karthus (for example). It's simply a really long cast time. So, the only way to interrupt it is to kill him.

There are only a couple abilities in the game that have this functionality. I believe it includes Lux's R and Cassiopeia's R.

I've noticed it isn't completely identical with other champions who have a similar wind-up before launching; some like Ez won't stop the Ult, while others like Nami will get interrupted (though not put on CD). I was interrupted by various CC 4 times in a row once trying to get my Tidal Wave off once. They're working as intended, it's just not intended to be the same for all similar abilities. (putting my bias on the table here, I'm a Nami main) I think they should be the same.

True shot barrage doesn't deal true damage... Logic