QListView - broken drag-n-drop items movement

#include <QFont>
#include <QApplication>
#include <QListView>
#include <QStandardItemModel>

class MyModel : public QStandardItemModel
{
public:
    Qt::ItemFlags flags(const QModelIndex &index) const override
    {
        Q_UNUSED(index);
        return Qt::ItemIsSelectable
                | Qt::ItemIsEditable
                | Qt::ItemIsDragEnabled
                | Qt::ItemIsEnabled;
    }
};
//------------------------------------------------------------------------------
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    a.setFont({"Verdana", 16});
    MyModel model;
    auto style = a.style();
    model.appendRow(new QStandardItem(style->standardIcon(QStyle::SP_DialogCancelButton), "cancel"));
    model.appendRow(new QStandardItem(style->standardIcon(QStyle::SP_FileDialogInfoView), "info"));
    model.appendRow(new QStandardItem(style->standardIcon(QStyle::SP_DialogOpenButton)  , "open"));
    model.appendRow(new QStandardItem(style->standardIcon(QStyle::SP_DialogSaveButton)  , "save"));
    model.appendRow(new QStandardItem(style->standardIcon(QStyle::SP_DialogOkButton)    , "cancel"));

    QListView list;
    list.show();
    list.resize(700, 500);
    list.setModel(&model);

    list.setIconSize({64, 64});
    list.setViewMode(QListView::IconMode);
    list.setWrapping(false);
    list.setResizeMode(QListView::Fixed);
    list.setMovement(QListView::Snap);
    list.setGridSize({128, 128});
    list.setSelectionBehavior(QAbstractItemView::SelectItems);
    list.setSelectionMode(QAbstractItemView::ExtendedSelection);
    list.setDragDropMode(QListView::DragDrop);
    list.setAcceptDrops(true);
    list.setDefaultDropAction(Qt::MoveAction);
    list.setDragDropOverwriteMode(false);
    list.showDropIndicator();
    return a.exec();
}