My Minecraft world was started in Pre-Release 20w18a were there was a bug that stoped end gateways from spawning. Since the update to 20w20a were the bug was fixed I have defeated the ender dragon 15 times and no gateways have spawned. I have done everything I can think of but they don't spawn. I have reset the end and also optimized the world and killed the ender dragon after both times.
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[Mod] markderickson
migrated
Hi there!
You may know this, but this is a result of MC-184482. Any world opened in 20w20b or 20w21a has this bug. This is not just an issue with the end dimension folder or the optimization. You will need to manually modify your level.dat file to fix this bug. You can look on that bug report for more information on how to fix your end gateway spawning.