Didn't fix double ender dragon fight

I was trying to get to the end islands by building out from the main island and ran out of blocks so I went back and made a duplicate of my save on Bedrock before I fought the ender dragon. I died so I went back to my second one and ended up with two ender dragons. A bug says this was fixed but apparently two summoned in instead. I tried it again in Creative and the same thing happened. I think the game has the enderdragon from the first save loaded in, but it thinks it needs a second one, sine when the end loads in it needs the ender dragon so it discards the first one ans summons a second as well. Please fix, now I have to fight two with chainmail armour! (I expected to get to get to the end islands and find a city to get diamond armour, but that didn't happen)