Further question on collection items

Further to my previous post on "next"/"prev" link, I managed to create links to item pages in a collection, with directory structure like this:

The default.md has one line in the frontmatter:

content:
  items: '@self.children'

And all directories have a file item.md. It works fine for "next"/"prev" page link.

Now I am trying to create "next"/"prev" in another folder:

In this case, the pages\07.thinker has a few folders, one of which 01.weekly will have various sub folders.

In pages\07.thinker\01.weekly\default.md, I inserted the

content:
  items: '@self.children'

into it. in pages\07.thinker\01.weekly\01...., I created item.md but it won't show the "next"/"prev".

So, does the "next"/"prev" support directory structures like this?

@pamtbaau As requested, I post the tree structure for reference.

I think I have found the issue: when I create the 2nd folder, it is now working. My mistake and you are right. @pamtbaau