The system for storing blog posts has been changed, it used to be that everything was stored in one file (blog.json), then shortly after two chunked files, blog.json and blog2.json; But wait! There's more, the new system uses something commonly known as an index, this index stores a list of every single blog post, its title, ID, Category, and most importantly what Chunk it's stored in.
So far there are only two chunks /posts/chunks/1.json and /posts/chunks/2.json, each of these chunks stores the contents and relating IDs of 20 posts, the logic should be set up to only retrieve the needed chunk(s)