Renamed End Crystal does not show in Death Message

When you rename a TNT Minecart with an anvil (e.g : Toby) and are blown up by it, the renamed TNT minecart's name is shown in the death message (Player was blown up by Toby).

When you rename an End Crystal (e.g : Tom) and blow it up, the death message does not include the new name (Player was blown up by End Crystal).

How to reproduce:

1) Rename an End Crystal

2) Place it down and walk 2 or 3 blocks away in survival

3) Do /summon lightning_bolt

4) "Player was blown up by End Crystal"