End cities missing, End bugged

Greetings,

Some friends and myself have a server in 1.19, we were playing regularly, and eventually beated the Ender dragon. Then the first strange thing occured: the portal for the rest of the end spawned, but without the little beacon thing to signal its presence.

At first we didn't really took it seriously and entered it. And then we spawned on the verge of an island without any portal for a way back. We then just adventured ourselves in the islands, searching for an end city, and never found one. I used a /locate, tp myself to the location. To find it empty. The island was barren (it had some chorus on it though. Simply no cities on sight.) so i had an idea.

Why not forcing the city to spawn ? I proceeded to /place the end_city, but it said it failed to place it. i tried to place only a jigsaw of it, it worked. But the full structure wasn't spawnable in its entirety. I was curious so i tried to place various structures, everything worked. Except the mansion, and the end city. Which "failed" to be placed.

After seeing a thread on this forum of persons with a similar problem, we decided to reset the end dimension by deleting the file DIM1 in our servefiles. Only to find that :

1. The end had the exact same generation.

2. The dragon and the portal to return to the overworld was missing.

3. It had realy reseted though. Our builds weren't there anymore.

In our despair, we tried to spawn it naturally, with some end cristals and with a hand made altar (we setted ourselves in creative to try to resolve the problem at this point.) but it never spawned. We made a good reproduction of it, centred on 0 58 0.

Then we tried to take the end from another world and place its folder into the serv's folder. My friend quickly generated a new game, and disconnected. then took the folder and unzipped it to place the DIM1 of the new world at the place of the DIM1 of the serv'. Nothing changed. Same generation, dragon missing, and no cities.

At this time I tried to spawn a city for the last time, and it worked.

So now we can make the cities spawn, but they don't naturally. The portal to return in the overlord isn't there, and we don't know how to spawn it.

We want to explore a natural end, with its cities and a way back. Do you have any ideas ?

We're playing on the 1.19 , not the 1.19.1 , the 1.19.
We are playing in vanilla, without any mods. Some of my friends have optifine but it's only for the shaders.

We found villages, i live in a shipwreck, and the nether forteresses (the wither one and the piglin ones) are spawning. The only structures we haven't already seen are the ocean temple (we haven't really been wandering in the sea though...), the mantion (which doesn't seem to be able to spawn too) and the jungle temple (haven't explored the jungle yet).