Background of checked QPushButton with stylesheet

[bouchebeu]

Hello everyone,

My problem is simple: my checked (not pressed) QPushButton background color (setted with stylesheet) is not displayed as wanted; it looks like a Qt::Dense6Pattern is present.
I tried to modify the stylesheet with different selectors, but no luck for now.

Below is the simplest code.

int main(int argc, char *argv[]){
 QApplication app(argc, argv);
 QMainWindow  win;
 QPushButton  b1("Button 1", &win);
 
 b1.setCheckable(true);
 b1.setChecked(true);
 b1.setStyleSheet("QPushButton {background-color: blue;}");
 
 win.show();
 
 return app.exec();
}

int main(int argc, char *argv[]){
 QApplication app(argc, argv);
 QMainWindow  win;
 QPushButton  b1("Button 1", &win);
 
 b1.setCheckable(true);
 b1.setChecked(true);
 b1.setStyleSheet("QPushButton {background-color: blue;}");
 
 win.show();
 
 return app.exec();
}

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Does this issue ring a bell ?

Thanks !