onNpcDeathEvent bug?

Hi! Me again! I hear the groans!

I'm testing the event methods with a system output line and believe I've stumbled on a bug? Here is my test method:

@EventMethod
    public void onNpcDeathEvent(NpcDeathEvent event) {
      System.out.println("NPC Death Event called. . .");
     }

I spawned a bunch of pigs, and started to slaughter them (I know the vegans are screaming out - trust me it was all done humanly!).

I tested the following weapons, [war hammer, long sword, small mace, mace, morning star, small battleaxe, pickaxe, axe, stone-axe, sword] all worked fine and I saw the following in the console.

NPC Death Event called. . .
NPC (ID: integer) deleted!

However, it appears that projectile weapons such as the musket and crossbow do not invoke this event method resulting in the console output:

NPC (ID: integer) deleted!