NamedView.new_page broken in 1.3-dev

Summary:

inkex's NamedView.new_page works as expected in Inkscape 1.2.2 but seems to have no effect in 1.3-dev.

Steps to reproduce:

  1. Unzip the extension provided under "Sample attachments" in your extensions directory.
  2. Launch Inkscape 1.2.2.
  3. Execute Extensions → Render → New Page Bug.
  4. You should now have two pages, named respectively "My first page" and "My second page", and a black circle halfway overlapping the second page.
  5. Exit Inkscape.
  6. Launch Inkscape 1.3-dev.
  7. Execute Extensions → Render → New Page Bug.
  8. Although the result should be the same as in step 4, I see only the black circle and no named pages.

What happened?

Inkscape 1.3-dev result:

new_page_1.3-dev

What should have happened?

Inkscape 1.2.2 result:

new_page_1.2.2

Sample attachments

Tiny extension that highlights the issue: new_page_bug.zip

Version info

Inkscape 1.3-dev (c5490bb, 2023-02-09)

    GLib version:     2.64.6
    GTK version:      3.24.20
    glibmm version:   2.64.2
    gtkmm version:    3.24.2
    libxml2 version:  2.9.10
    libxslt version:  1.1.34
    Cairo version:    1.17.7
    Pango version:    1.44.7
    HarfBuzz version: 2.6.4

    OS version:       Ubuntu 22.10