QPushButton in checked state shows incorrect background styling within Popup window on macOS.

When a checkable QPushButton is placed inside a Popup window (Qt.WindowType.Popup), the checked state styling fails to properly update the background color on macOS. The button text correctly changes to white, but the background remains unchanged from the unchecked state (typically light gray). This creates a "text disappearance" effect in light color themes since white text is displayed against a light background.