VerticalHeaderView/TableView required properties go all over the place when using syncView

TableView {
    id: tableView
    anchors.fill: parent
    leftMargin: checkColumn.width
    clip: true
    model: TableModel {
        TableModelColumn { display: "name" }
        rows: [{ "name": "Harry" }, { "name": "Hedwig" }]
    }
    selectionModel: ItemSelectionModel {
        model: tableView.model
    }
    delegate: Rectangle {
        implicitWidth: 100
        implicitHeight: 30
        color: selected ? "blue" : "lightgray"
        required property bool selected
        Text { text: display }
    }
}
VerticalHeaderView {
    id: checkColumn
    parent: tableView
    syncView: tableView
    selectionModel: tableView.selectionModel
    boundsBehavior: tableView.boundsBehavior
    delegate: CheckBox {
        required property int row
        required property bool selected
        onRowChanged: console.log("onRowChanged", row, selected)
        onSelectedChanged: console.log("onSelectedChanged", row, selected)
        checked: selected
        onToggled: tableView.selectionModel.select(tableView.model.index(row, 0), ItemSelectionModel.Toggle | ItemSelectionModel.Rows)
    }
}