Create button is missing for confluence-users group members

When user opens a specific space with a restricted homepage, the Create button disappear at the top right of the page and the "exception" below is thrown:

{annotations: [{}], collectionInheritableAnnotations: [{}], declaredAnnotations: [{}], description: Annotated value: Create; Annotations: [@com.atlassian.confluence.velocity.htmlsafe.HtmlSafe()]}

Steps to reproduce:

1. Create a space and a page.
2. Create a group with full access to this page: View, Add, Delete permissions to All, Pages, Blog, Comments, Attachments, Restrictions, Mail and Space (Export , Admin).
3. Edit the permissions of this space in a way that confluence-users can only add comments and export the space(only Export), but with "View" to "All" selected.
4. Restrict the "Edit" functionality of the page recently created to the group with full access;
5. Create an user and add him into with confluence-user group only. Access the page referred before.
6. Notice that the Create button is missing and instead of it there's a long message, similar to a not rendered code (see attached screenshot).