On windows, using multisite.
I'm having an issue where I create a menu tab in Appearance menus.
I can add custom links without issue.
Some pages when checked do not add to the menu although they appear to. The menu acts like it updates and if you try to navigate away you get a warning that you will lose your changes. If I save the menu the item still doesn't show up.
I disabled all plugins and am still experiencing this issue.
Any help is appreciated.