QComboBox QSS padding-left Does Not Change Icon Position

When using QSS to set the padding-left property for a QComboBox, it does not affect the positioning of the icon displayed in the combo box (subcontrol CE_ComboBoxLabel). The expected behavior is that increasing the padding-left should move the icon further to the right, but it appears that the icon remains aligned with the left edge of the combo box.

QComboBox *comboBox = new QComboBox();

comboBox->addItem(QIcon(":/path/to/icon1.png"), "Option 1");
comboBox->addItem(QIcon(":/path/to/icon2.png"), "Option 2");
comboBox->addItem(QIcon(":/path/to/icon3.png"), "Option 3");

comboBox->setStyleSheet("QComboBox { padding-left: 20px; }");