Can't add email to existing contact
My sister recently changed her primary email, so I want to add it to my contacts. I've tried manually adding it in the contacts app, and through the click-menus in mail when I click on her new email address. But whenever I even manage to get to add a new email field, when I click done, it disappears. Even when I try to delete her old email, when I click done, it reappears. How can I add a new email to her contact, and also make it the default one?
Also, this new email is already on my phone contacts, but for some reason did not get carried over.
MacBook Air 13", macOS 10.15
