So I had seen that this bug had previously been resolved but I have encountered it post-resolution
I had defeated the Ender Dragon for my Youtube Series and had now beaten it again yet no End Gateways have appeared, I took my spectator account on and flew out a bit and even checked under the End Island to no avail!
So, for now, I am bridging out to the Out Ends.
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Yes sorry I just found that post my apologies, Do you know what I need to change in lvl.dat to spawn end gateways?

It is mentioned in the comments on MC-184482, however, it is not supported and can cause damage to your world if done incorrectly.

That is why I asked you if you knew the proper way to do it.

The recommended way is to use a backup from 20w20a or earlier.

Well, that doesn't help me much, thanks for your time anyway.
Did you start the world in the early 1.16 development versions?