So, basically this bug cointains one more bug in it, so lets get started:
1.(mobgriefing must be off) Going in the end and running the command : execute @e[type=ender_dragon] ~ ~ ~ setblock ~ ~ ~ portal, a couple of times until the dragon disappears and the home portal opens up
2.Back at spawn you see the dragon but with NoAI, and if you unload the chunks , it dissapears.
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Cleaning up old tickets: This ticket has not been updated recently (~1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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Simplified ticket to contain one issue.
Please put only one bug report in each ticket. It is very difficult to keep track of bugs when they are not in their own tickets, and it is easier for you to make multiple tickets than for the mods to separate them. (If your ticket does not look like the example given here, then it's likely to be closed.)