Making The Dragon Egg Immortal

The Ender Dragon Egg is the only item in Minecraft that generates only once, in every world. It is non-renewable, meaning it can be risky to use, and if it is destroyed, it permanently gates the advancement "The Next Generation." Misplacing it in lava, ejecting it into the void, leaving it on the pedestal, or even leaving it on the ground for too long, can cause the permanent erasure of the item and advancement.

This is why I believe the Ender Dragon egg should not be able to exit a world permanently. Not by making it unable to be destroyed, but by making it "immortal." I propose that, whenever the Ender Dragon is defeated, it checks a special value tied to the sole Dragon Egg. If it determines the egg has been destroyed, or is no longer in existence, it will regenerate the egg upon the fountain, as if the Ender Dragon had only just been defeated for the first time.

This prevents frustration with losing a dragon egg, makes the aforementioned advancement permanently obtainable, and makes the Ender Dragon Egg safe to display, knowing that you can get it back, even if you have to re-fight the Ender Dragon.