Navigation tree not showing in Page Administration > Look & Feel > Themes on Chrome

Steps to reproduce:

1. Log in as Admin
2. Access any page
3. Click on More Actions > Administer Page > Look & Feel > Themes
4. Change the Color or Icon Theme
5. Click on Save

Expected results: The changes are saved.

Actual results: The changes are saved but the Navigation tree disappears.

Note: This only happens on Chrome. On Firefox and IE it's working. Also tested on standard version of XWiki 10.7 and it's working.