Cannot create a new page when a user has no 'edit' permission for the parent page

I want to protect the WebHome page of a space while making all other pages in the space freely editable, but it seems impossible.

When a user with 'edit' permission attempts to create a new page from WebHome, where the user has no edit permission, XE denies the access.

For example:

• There's a space called MySpace.
• MySpace can be edited by any registered user. (Space-level permission)
• MySpace.WebHome can be edited only by admins. (Page-level permission)
• If a non-admin user visits MySpace.WebHome and clicks the 'Add -> Page' menu item to create a new page:
  • The edit action URL is '/create/MySpace/WebHome'
  • The user sees a permission denied error.
• What's interesting is:
  • If the user manually enters the edit action URL with non-existing page name such as '/create/MySpace/MyNewPage', the user can create a new 'MyNewPage' under 'MySpace'.
  • The user can even set the parent of 'MyNewPage' to 'WebHome', which contradicts the permission denied error the user got above.