Flagrant foul during the shot

[APG]

That fact is you'll find that in none of the codes do you penalize an intentional/flagrant foul (or their equivalents in other codes) during a try with two shots for the act of shooting plus two shots for the intentional/flagrant.

NFHS: 2 shots + ball unless it's a missed three point attempt
NCAA: Same as NFHS
NBA (Flagrant Type I/Type II): 2 shots+ball unless a missed three point shot. If a made basket, the opponent would have a 2 free throw attempts to make 1.

All three bodies deem the penalty of free throws, possession, and possible ejection enough of a penalty.