When I was working on a bedrock farm because I was making a museum of forbidden blocks and you have to have the unbreakable block in there, I ran into a wild glitch. I know for a fact that the egg was in my melon farm chest and in the over world (about 9000 blocks away) but the dragon was still summoned. After I had fought it another egg appeared and then there were two eggs.

How to replicate.
Go into any world and go into the end.

Start placing the end crystals as you normally when summoning the ender dragon but leave the egg out.

You will then see the animation start the happen then a insanely O.P. dragon will appear and will two shot you with its dragons breath (even with a totem)

What I expected to happen was no dragon appearing and me getting my bedrock for my museum

What happened was a insanely O.P. dragon appeared and almost killed me.

I must have the bedrock for my museum and take the bedrock out of bedrock edition and just make it edition.