I was first time in The end in Survival mode. I've never turned cheat on in that world. First I saw only one HP bar of Ender dragon, but as soon as I came close to them, like more then 20 Ender dragons were spawned. The game became extremely laggy, and I died in the matter of seconds.
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duplicates 1
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Like @Don Cox said, it's a duplicate of MCPE-37590 happens when you die in the End.
Thanks for your report! However this seems to be a common issue among the player-base and as such has already been reported. (MCPE-37590) Make sure to search for your issue before reporting. Additionally, if you have any thing to add on to the conversation fell free to use the comments on MCPE-37590. Have a great day! 👍