When a Player is Killed by an Item/Weapon that is Re-Named, it does not show the Item Name in the Death Message as it Does in all other Versions of Minecraft.

For Example:

If i was killed by a Player using a Sword named Light Bringer, it should say "Killed by Player with Light Bringer" or something along those lines. As i mentioned before, this is already a feature in all other versions of Minecraft, why is it not working in this one?