updating multiple notifications each second in android doesn't work

I have a foreground service which is basically used for counting down from certain number.

As 1 foreground service can have only 1 notification, I show other notifications using notification manager, and update content after each second. Problem is notifications are shown all, but after 2 or 3 seconds, let's say if 5 notification shown, only 2 of them are being continued to update, remaining 3 are not updating

In docs it says that rate is applied to noticication updating, but I can see samsung clock app can update its notifications (only 3 of them can be shown at a time)

Any way to solve this?

private fun startCounterService() {
    ServiceCompat.startForeground(
        this,
        100,
        getNotification(0),
        ServiceInfo.FOREGROUND_SERVICE_TYPE_SPECIAL_USE
    )
    startCountDownTimer()
}

private fun startCountDownTimer() {
    timerJob?.cancel()
    currentNotificationIds.forEach { showNotification(it, 9) }
    timerJob = CoroutineScope(Dispatchers.Main).launch {
        var counter = 0
        while (true) {
            currentNotificationIds.forEach { showNotification(it, counter) }
            delay(1000)
            counter++
        }
    }
}

private fun showNotification(id: Int, counterValue: Int) {
    notificationManager.notify(id, getNotification(counterValue))
    currentNotificationIds.add(id) // this list is a set of ids
}

private fun getNotification(counterValue: Int): Notification {
    return getNotificationBuilder().setContentText("Counter value is now: $counterValue").build()
}