In the US the door close button is required to work in "fire service" mode, so that's why the button is always there.

Outside of fire service the button most likely will work, just that it can't override the minimum open door delay mandated by the ADA, so it feels like it doesn't work. You may be able to trick the logic into disregarding the timer by pressing door open and door close immediately.

In Europe, there is no "fire service" mode that I know of, so the button isn't always there. But if it is, it basically always works and doesn't have a minimum delay.