Steps to reproduce:
1. Login as superadmin.
2. Create a Regular Role (Global WC Admin), and add View Permission in Web Content Structures and Web Content Templates. These permissions could be limited to the Global Site but is not necessary, however the issue has been tested with both types of permissions.
3. Create an user, user1.
3.1 Add user1 as Site Administrator of the Liferay Site.
3.2 Add the role Global WC Admin to the user1.
4. Create a Web Content Structure in Global (str1), and add two templates for str1: tpl1, and tpl2
5. Add a Web Content Display to the Liferay home page.
6. Login as user1, try to add a new Web Content in the Web Content Display, and change the Structure to str1.
Result: You can not change the structure because the list is empty
Expected: You can select the str1 and add a new web content, using any one of the global templates of str1