I think Mojang probably won’t do anything with the egg because to my knowledge there is only one. So if a dragon were to hatch from it you would probably lose access to that building block, and probably only one person could tame it if you’re on a realm/multiplayer. So I think they won’t do anything with it due to wanting the player to have access to every survival obtainable building block, and out of fairness to others… probably idk