"Edit Link" resets data

For what it’s worth, you can edit the JS for this field, changing:

jQuery('body').on('click', '.link-btn', function(event)
        {
            var thisID = jQuery(this).attr("id");
            doingLink = thisID;

            wpActiveEditor = true; // we need to override this var as the link dialogue is expecting an actual wp_editor instance
            //console.log(wpLink);
            wpLink.open(); // open the link popup
            return false;
        });

To:

jQuery('body').on('click', '.link-btn', function (event)
        {
            var thisID = jQuery(this).attr("id");
            doingLink = thisID;

            wpActiveEditor = true; // we need to override this var as the link dialogue is expecting an actual wp_editor instance
            wpLink.setDefaultValues = function () {
                $('#url-field').val($('#' + doingLink + '-url').val());
                $('#link-title-field').val($('#' + doingLink + '-title').val());
            };
            wpLink.open(); // open the link popup
            return false;
        });