PigZombieAngerEvent is completely borked

[drunderscore]

What behaviour is expected:

Canceling the PigZombieAngerEvent makes the pig zombie not angry, and doesn't propagate his anger to nearby pig zombies.

What behaviour is observed:

Pig zombie becomes angry regardless, propagates anger to nearby pig zombies, and continuously calls the event to decide if he should remain angry, despite remaining angry regardless of the cancellation of the event.

Steps/models to reproduce:

@EventHandler
private void onPigZombieAnger(PigZombieAngerEvent e)
{
    Bukkit.broadcastMessage("he angry with " + e.getNewAnger());
    // Even setting the angry of the pig zombie to false here does not properly work.
    // e.getEntity().setAngry(false);
    e.setCancelled(true);
}

Paper version:

Paper 526

Anything else:

The problem also occurs in spigot. Should this be put to the spigot JIRA?