Some more context. I'm looking at the play-by-play and its registered as a miss. The announcers also missed this, which is how I noticed it didn't count because they called it how it was such a bad shot which was weird when I saw it go in.

Frankie, when he shot it, also immediately ran the other way down the court, in one of those situations where it felt so clean off the hand that he knew it went it.

Maybe a second pair of eyes on this can tell me I'm really dumb

Had to be an airball.
KD stands during the game and doesn't miss much
if anything that happens. If it's a goal and not recorded
KD would have let the officials know in a robust manner.

I know the shot you are talking about.   I was sitting in upper deck.  It was an air ball that grazed the net.   I remember this because a lot of the crowd reacted like it was a three. 

From my vantage point it was clearly an air ball.

Well, that seemed to have cleared things up a bit. Thanks for your input, everyone