QMimeType detect gif file return incorrect suffixes

#include <QtWidgets/QApplication>
#include <QMimeDatabase>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QMimeDatabase db;
    auto mime = db.mimeTypeForFile("1.gif", QMimeDatabase::MatchContent);
    auto suffixs = mime.suffixes();

    return a.exec();
}