Menus title attribute disappeared after upgrading to WP 4.5.1

Hi,

I used menus title attribute to add description to menu items in WP 4.4.2.
After upgrading WP to 4.5.1 I cannot find that field anymore.
Furthermore, I can still see the menu descriptions that were added before but if I add another menu item then I loose them all.

Anybody experienced the same problem or has some suggestions?

Thanks,
Dario