I have a world that I have been playing on with my friends since January and we used the 1.18 preview datapack (attached below) and when I try to update the world to 1.18 nothing blends. I really want to update this to 1.18 as we have made so much progress and I am looking for ways I could update to 1.18 with the chunk blending. Any help is appriciated!

To Recreate:
1) Make a world in 1.17.1 with the 1.18 preview datapack

2) Delete the datapack from the world file

3) Open the world in 1.18.1 or 1.18