EntityDamageByEntityEvent Bug

[cleargothic]

Expected behavior

it has to return damager's holding

Observed/Actual behavior

When an EntityDamageByEntityEvent occurs, getActiveItem always returns AIR (empty-handed)

Steps/models to reproduce

this is my plugin source
@eventhandler
public void onEntityDamage(EntityDamageByEntityEvent event) {
if (event.getDamager() instanceof Player) {
Player player = (Player) event.getDamager();
ItemStack activeItem = player.getActiveItem();

        if (activeItem.getType() == Material.AIR) {
            player.sendMessage("You are attacking with an empty hand!");
        } else {
            player.sendMessage("You are attacking with a " + activeItem.getType().name());
        }
    }
}

Plugin and Datapack List

just my plugin only(that has no function)

Paper version

This server is running Paper version 1.21.4-69-main@bdfad1c (2025-01-01T00:57:45Z) (Implementing API version 1.21.4-R0.1-SNAPSHOT)
You are running the latest version
Previous version: 1.21.4-66-d00344a (MC: 1.21.4)

Other

getInventory().getItemInMainHand works.

[electronicboy]

'using' is a specific game concept, i.e. consuming food, using a shield, drawing a bow, etc; it does not cover general interactions/attacks