Java snapshot 21w37a, no end portals or nether biomes

So after playing in survival on a world I noticed the nether biomes show on f3, but it all looks like old nether. there is not nether trees or plants. After that I tried to go to the end I used a eye of ender and nothing happened, so I created a new world with cheats and I searched for it and it says structure not found. So currently the nether needs fixing and we need strongholds and end portals back.