It is possible to configure a content type with a right to allow creation of a new content of this type.

This right will be used to display or not a content type in the "Add content" gallery. => OK

But this right will not be checked during the actual creation => KO

Step to reproduce :

• Take a user with the right to add a content to a page and the Web_Right_Article_Create right on general context.
• Select the zone and click on the "Add Content" button (but don't select any type yet).
  You should see the "Article" type in the gallery.
• Using a different browser, log in with a different user and edit the first user right so that he doesn't have the Web_Right_Article_Create right on general context.
• Get back to the first browser and add a new article to the zone. (without refreshing the page or reselecting the zone.)
• The creation succeed => KO