4 Ender Dragons on Outer Islands?

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I killed the Ender dragon for probably about 4-5th time and entered one of the old portals to the outer islands. As soon as I entered I go attacked by 4 Ender Dragons at the portal !? On an outer island.
What and how causes this ? After some time they flew away into the distance and glitched at max-render-distance.
Should I be careful from now on as I enter other outer islands?
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How do you get to the end islands without killing the Ender dragon?
The Ender Dragon spawns naturally in The End when the Player enters the Dimension. But once killed, it can only be re-spawned by placing four End Crystals around the Exit Portal.Can you spawn the Ender dragon outside of the end?
It's about 1000 blocks from the main island so the journey is a harsh one. You'd need something like 20 stacks of blocks to try and make the journey AND hope the Ender Dragon doesn't manage to swoop at you and knock you off.How far are end islands from dragon?
Throughout the End, more End Gateways will generate as a player respawns the Ender Dragon and kills it. The maximum amount of End Gateways that can be created is 26.Alternate Ender Dragon \
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