check out MCPE-45862 and upvote it
This issue happens on Switch as well
You need to go to chunks that weren't loaded yet. You must have pre-loaded the chunks you were in.
Yeah me too. It happened on my main survival world.
The same also happens with my world I made back in 1.8. I also had the same thing happen to me MCPE-46347
Did you try the command /kill @e[type= ender_dragon]