Based on the official documentation to create menu links I've tried to use an internal link on the administration menu. But the internal link is only visible for users with administrator rights.
my_module.links.menu.yml I use the following links for testing:
my_module.test_link: title: 'TEST LINK internal' url: internal:/node/add description: 'TEST internal' parent: system.admin_content weight: 99 my_module.test_link_2: title: 'TEST LINK external' url: https://www.stackoverflow.com description: 'TEST external' parent: system.admin_content weight: 100
Both links are visible for administrators, but an user with editor role does only see the external link.
I activate every permission for the editor role, the link remains invisible.