Steps to reproduce:

1. Install clean installation of Ibexa DXP  
2. Configure "internal" and "content" field groups
3. Create "test" content type and add an "internal" field of type ezauthor to "internal" field group 
4. Add editor user and set Content/Edit policy with Field Group: content limitation
5. As editor user, create "test" content object, fill in the fields in "content" field group
6. Try to save or publish

Result:

Access denied (attached screenshot)

Expected result:

Content is published correctly