I have already generated one gateway in a survival world but after fighting the dragon no additional gateway was generated, I replicated this by reloading the save file I had prior to the fight and the same happened again.
I then travelled to the outer end and found an additional end gateway near the first one I already had, teleporting through it brought me back to the obsidian spawn platform in the end.
I am unable to attach my DIM-1 file as a zip due to the size that I believe would be needed to replicate the issue.
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It does but either reloading the world doesn't work or I'm unclear on how to reload the world, I've exited and re-entered the end, restarted the game and my PC.

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Does MC-171797 describe your issue?