QPushButton setEnabled(false) doesn't grey out button

The title says it all. In Qt 6.2.4 & 6.3.0 on macOS, calling QPushButton setEnabled(false) stops the button from being clicked or pressed, but doesn't grey the button out (as per all previous versions of QT up to Qt 6.2.2. I haven't tried 6.2.3)).

Seriously QT folks, why are common, basic, simple controls being broken in newer versions of QT? (See my previous report about QMenu appearing on the wrong display.) These mistakes are unacceptable. I'm a QT licensee who has just rolled out app updates, based on QT 6.3.0, to customers, only to find that basic UI functionality looks bad and isn't operating as a user would expect from the look.