QFileDialog::setMimeTypeFilters gives weird results on mac

I created a file dialog as follows:

    QFileDialog dialog(parent, title, dir);
    QStringList filters;
    for ( const auto& baf : QImageReader::supportedMimeTypes() )
        filters.push_back(QString(baf));
    dialog.setMimeTypeFilters(filters);

    dialog.setAcceptMode(QFileDialog::AcceptOpen);
    dialog.setFileMode(QFileDialog::ExistingFile);

It works fine on Windows/Linux but on Mac has a weird effect.
There it seems the actual filter is offset compared what the dropdown shows.
I attached some screenshots to illustrate:

The png file isn't active when the PNG filter is selected, but it becomes enabled when the SVG filter is enabled. It seems to be a trend for all filters: that they show the files from the filter above them in the drop down.