Drupal 8 - some child pages are not visible on particular book using view

Question

I would like to ask for your help as I'm having a trouble in displaying some child pages of a particular Book in Drupal 8 using view. There's a book which displayed all the child pages but there's some book which displayed incomplete child pages and some book, doesn't display the child pages at all.

I created two views, one for the list of all top level book and the other one is for the child pages.

Here's what I have done on view settings:

to display the list of book:

Format: Unformatted list
Show: Fields
Filter Criteria: 
  Content Published (=Yes)
  Content: Content type (= Services)
  Book: Depth (= 1)
Sort Criteria: Content: Title (asc)

to display the child pages:

Format: Unformatted list
Show: Fields
Filter Criteria: Content Published (=Yes)
Sort Criteria: Content: Title (asc)
Contextual Filters: (Book Parent) Content: ID 
Relationships: Book Parent
Configure Relationship: Book Parent : Required this Relationship

After saving it, I added this to the block layout.

I'm not sure what went wrong on my settings.

Thank you in advance for you help!

Answer 1

I'm not too experience in Drupal. But normally I would not use Views for the child pages. If the book module is enabled, the BOOK NAVIGATION block will be available to list with hierarchy like a table of content. You can select in the option to display only for book pages under a particular book. Not sure whether this helps.