New UI messed up my list sections

All of a sudden overnight my json creating my list sections doesn't work. Is this a result of the new UI? Do the sections just not work anymore?

{

    "sections": [

        {

            "displayname": "Administration & Communication",

            "fields": [

                "Title",

                "Multiple Lines",

                "another column",

                "last column",

                "Choice column"

            ]

        },

        {

            "displayname": "",

            "fields": [

                "webex"

            ]

        }

    ]

}