When I first entered The End in my world, Ender Dragon did not spawn! Neither the portal back nor even an End Gateway! So here is the screenshot of the absence of the portal back to the Overworld:
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Asteraoth
Thank you for your report!
However, this issue is a Duplicate of MC-137467.
If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
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