End Gateways don't generate after defeating the ender dragon

For anyone that needs a temporary solution, you can bridge about 1000 blocks in any direction from the main island to reach the Gateway islands. I did this in my survival world yesterday. It takes a while but you will get there if you have enough blocks. On the outer islands I did find a Gateway I could use to get back on the main island. The problem seems to only occur with the Gateways that appear after defeating the Ender Dragonn

I think a better workarround is just create a new world, with the same seed, in a old snapshot (20w19a is more guaranteed to work), kill the dragon on creative, then copy this new world DIM1 folder to your main world.

If this bug gets fixed I hope that the portals that were supposed to generate will generate (maybe make it so the game remembers that you killed the dragon and how many times) so people don't have to fight the dragon again. For now, is there a way to generate the portal with commands(maybe structure blocks)?

You can generate gateway right above your head with this command.

/setblock ~ ~2 ~ end_gateway

Thank you for that info.

20w22a - Server seed is 739723400 

reset the end (deleted DIM1 Folder)

ender dragon took 30 seconds to spawn in maybe a minute

did /kill @e[type=ender_dragon] - The Sky lights up, Dragon Egg spawns, exit portal appears, No Gateway still

If I go into a singleplayer and make a new world, the problem does not exist anymore.

EDIT: I figured out the issue was since the end was created in 20w21a, the way to fix this issue (For me atleast) is to delete the DIM1 folder, then use NBTExplorer to modify the level.dat file inside the world folder and delete the Dragon Fight Entry, then start the server up again, go to the end, and kill the dragon. The Gateway will spawn as expected.

Its fixable for worlds corrupted. Open your level.dat with NBTEditor, then navigate to  [Your World's Name] > level.dat > DragonFight. There should be a list of numbers from 0 to 19, randomly ordered, but the list will be empty. You can just add the numbers from 0 to 19, or create a new world and open this new world with NBTEdit, then copy the list from the new world to the old one.

Luis Vervaet, did what you said and the first fight generated an end gateway, thanks 🙂
Hopefully it will work for the other 19 fights, lol

For me - NBTEditor won't work.

It just doesn't want to load the level.dat file.

Here's the log:

System.Exception: Unknown TagId '11'.
at NBTedit.NBTView.Load(String filename)
at NBTedit.MainForm..ctor(String filename)

Anyone can help?

EDIT: Nevermind i fixed it.

Use NBT explorer, it's more recent and supports a relatively newly added tag, should fix that problem
https://github.com/jaquadro/NBTExplorer/releases

Having played through from earlier versions, and into 1.16-pre2 (we hadn't tried to kill the ender dragon in those earlier versions), we hit this issue after killing the Ender Dragon.

Indeed on checking, the level.dat, the level.dat -> Data -> DragonFight -> Gateways entry was just an empty entry.

I rolled my server back to when the ender dragon was still alive (thanks, ZFS Snapshots. 😉 ) and left the server down, created a new world (using a 1.16-pre2 server), and using NBTexplorer (from the link above) navigated though to the gateways entry - and saw all 20 entries there. I clicked copy on the Gateways folder entry, then navigated to the level.dat of my existing server, got to the DragonFight spot, deleted the old gateways entry, then whilst having the DragonFight entry selected, hit paste, which dropped the fully populated Gateways entry in.

Save, startup server, and on /kill ing the ender dragon, the gateways spawned. 

Win.

Thanks everyone who contributed - You made my 7 year old's day... He was most unhappy there was no gateway. (I'll add he was also not happy that the End city near the first gateway had no flying boat! (but that's another matter. 😉)

Thanks again.