QQmlTableModel is not notifying about changes of its data

Q_PROPERTY(int columnCount READ columnCount NOTIFY columnCountChanged FINAL) Q_PROPERTY(int rowCount READ rowCount NOTIFY rowCountChanged FINAL) Q_PROPERTY(QVariant rows READ rows WRITE setRows NOTIFY rowsChanged FINAL)

    // Gather metadata the first time a row is added.
    if (mColumnMetadata.isEmpty())
        fetchColumnMetadata();

    endInsertRows();
    emit rowCountChanged();