Combobox don't get style update when closed by click outside it

Steps to reproduce:

You need a styled combobox with :open and :closed pseudostates.
Click on the combobox body to open it (not on the collapse button).
Combobox has a new style.
Click outside combobox to close it.
Style doesn't get updated.

    auto combo = new QComboBox();
    combo->setStyleSheet("QComboBox:open { border: 1px solid green; } QComboBox:closed { border: 1px solid red; }");
    combo->addItem("");
    combo->show();