Setting Qt::WA_TranslucentBackground gives black background

Setting transparent using Qt::WA_TranslucentBackground  gives black background in windows. Below code gives transparency in linux but not in windows.

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow)

\{

setStyleSheet("background:transparent;");

setAttribute(Qt::WA_TranslucentBackground);

ui->setupUi(this);

}

Tested Windows version is Windows 10.

Issue Frequency  : Always reproducable