Description

Step-by-step reproduction instructions

Using a Full Site Editing theme such as TT1-blocks

1. Create a post with multiple page page breaks
2. Save
3. View
4. The Pages: links do not appear.

Expected behaviour

Ability to view the individual pages by clicking on the links.

Pages: 1 2 3 4 5 

There should be links for the pages which aren't the current page, with each link containing the page number of the page to view. https://blocks.wp-a2z.org/block/page-break-core-nextpage/2/

n+1 pages where n = number of page break blocks used.

Actual behaviour

The Pages: links do not appear.
It is possible to navigate to the other pages. But there are no visual clues.

Screenshots or screen recording (optional)

Expected results. Unchanged from how it works for a non-full site editing theme.

Code snippet (optional)

WordPress information

• WordPress version: 5.6.2
• Gutenberg version: 10.0.2
• Are all plugins except Gutenberg deactivated? No.
• Are you using a default theme (e.g. Twenty Twenty-One)? No. This example uses https://github.com/bobbingwide/fizzie

Device information

• Device: Desktop
• Operating system: Windows 10
• Browser: Chrome 88