The Content Items assigned to a section are not displayed "Content items in this section tab".

Steps to reproduce:
1. Go to Admin Panel -> Sections
2. Choose a section with greater than zero "Assigned Content Items" value (for example "Standard")
3. Go to "Content items in this section (X)" tab

Expected:
Names of Content Items assigned to that section are displayed

Actual:
There is no list (only button "Assign to content").