QComboBox stylesheet breaks it.

When i apply the flowing qss to QComboBox the checked item becomes huge:

typeComboBox->setStyleSheet("QComboBox::item:checked { font-weight: bold; }");

or

typeComboBox->setStyleSheet("QComboBox::item:checked { font-weight: italic; }");

It affects all versions I have tested > 5.12

I am sending a simple illustration program based on "Combo Widget Mapper Example" along with a screenshot.