`UNTimeIntervalNotificationTrigger` repeats: true only fired once. macOS bug? Works on iOS

问题

I want a notification to show every 60 seconds. It only happened once on MacOS. The same exact code works normally on iOS.

If I manually remove the notification from macOS notification center, it'll eventually show again. So the problem seems like notification won't show again if it's already showed once and the user didn't take any action.

Did I miss something obvious here?

Current macOS: 10.15.4 Current iOS: 13.4.1

on App Delegate

func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        completionHandler([.alert, .badge, .sound])
    }

on DidLaunch equivalent (iOS and macOS)

let center = UNUserNotificationCenter.current()
        center.delegate = self

        center.requestAuthorization(options: [.alert, .sound, .badge]) { (grant, err) in
            if grant {
                let content = UNMutableNotificationContent()
                content.title = "AY"
                let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 60, repeats: true)
                let req = UNNotificationRequest(identifier: "ay", content: content, trigger: trigger)
                center.add(req)
            }
        }

来源：https://stackoverflow.com/questions/61872174/untimeintervalnotificationtrigger-repeats-true-only-fired-once-macos-bug-wo