Ender Dragon respawns after you die

Hello Mojang!

I am Herobrine171639 (Known as LuckyCreepers on java) i found a bug that is very annoying, when you kill the Ender Dragon and you die right after, you will go into the end to get your stuff and you will see the Ender Dragon is respawned How is this possible I dont know.

 

Thanks for your help

Herobrine171639