After respawning the end dragon, a couple of the end crystals have become indestructible. They maintain the white beam that summons the dragon is still there. Those crystals are impervious to all damage and unable to be destroyed. Therefore, the dragon is unable to be killed as he refills his health bar during the fight.
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Ok This Just Happened..ย
https://www.youtube.com/watch?v=q11pKBnu4DI
And
https://www.youtube.com/watch?v=6n0YxCSdScE
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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If I'm correct, then end crystals are entities. So try using this command: /kill @e[type=end_crystal]