Please help me, It's important for me

When I was a kid I used to have a little world with my childhood friends, and it's very dear to me, and i downloaded the map from %appdata%/.minecraft/saves, but the only thing saved is the seed, bcz when i enter the world nothing is there except from the biomes, but no buildings, itens, etc, just the ghost of a memory i had

please can someone shed a light about this topic for me, is everything really lost, or the map is encrypted or sum

(this place used to have a giant hole and some houses)

https://preview.redd.it/ewy9j4h8ei4g1.png?width=1920&format=png&auto=webp&s=fbe0a5d93bc5444b4d3d090ec29cd3befa478794