Can't move a specific page, others can be moved

A client has a subpage on a page that he wants to move to the site level. All pages have the same “content” template/blueprint. But only this page can not be moved to site, all other pages on this subpage can be moved to site.

The page that needs to be moved (notice the grayed out Site):

There are no other move rules/permissions in any of the blueprints. We can’t find out what is going on here. Anyone has an idea?

Another subpage that can be moved (notice Site is not grayed out):

Hm, the screenshots are not very helpful, as they both show the same parent page highlighted.

What is the difference between the two pages you are trying to move?

Please also post the site blueprint.

There is no difference (except the content), both are published pages using the same blueprint. Other pages on this subpage can be moved to Site as well, as well from other parent pages, all using the same blueprint. Only this single page is not possible to move to Site.

Pages section of the site.yml:

tabs:
  Algemeen:
    icon: page
    columns:
      - width: 1/2
        sections:
          published_pages:     
            headline: Openbare pagina's
            type: pages
            status: published
            layout: list
            info: "{{ page.intendedtemplate }}"
            image:
              image: icon
              back: white
              color: black
              cover: true
              query: page.images.first.toFile

      - width: 1/2
        sections:
          draft_pages:
            headline: Concepten
            type: pages
            status: draft
            layout: list
            info: "{{ page.intendedtemplate }}"
            create:
              - content
              - insight

All pages can be moved to Site except the “flyerpakket” one:

@texnixe solved it finally. There was a concept page using the same url as the page would get if moving would be possible. But that was not very easy to spot with 40+ concept pages :sweat_smile:

Maybe an error stating reason why move is not possible, or enforce the move with a different url would be nice on sites with a lot of pages.