Exact alarm is not firing on WearOS

Question

I want to keep the screen on for a minute on WearOS.

This simple task is such a difficult to handle on Android/WearOS, and all online solutions are simply doesn't work:

class MyActivity: ComponentActivity() {
    var mAlarmManager: AlarmManager? = null;

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent { ... }
        mAlarmManager = getSystemService(ALARM_SERVICE) as AlarmManager
        d(TAG, "onCreate")
    }

    override fun onResume() {
        super.onResume()
        d(TAG, "onResume")

        // Let's keep the screen ON ...
        window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)

        // ... but listen for a timeout and release the lock
        registerReceiver(screenTimeoutReceiver, IntentFilter(ACTION_RELEASE_SCREEN_WAKELOCK));

        // Fire this intent with the alarm manager
        val releaseScreenIntent = PendingIntent.getBroadcast(
            this, 0, Intent(ACTION_RELEASE_SCREEN_WAKELOCK),
            FLAG_UPDATE_CURRENT
        )

        // Define a 1 minute later date and time for alarm manager
        val calendar = Calendar.getInstance()
        calendar.timeInMillis = System.currentTimeMillis()
        calendar.add(Calendar.MINUTE, 1)

        // And ask for an exact timer
        mAlarmManager?.setExact(
            AlarmManager.RTC_WAKEUP,
            calendar.timeInMillis,
            releaseScreenIntent
        )
    }

    val screenTimeoutReceiver = object : BroadcastReceiver() {
        override fun onReceive(context: Context?, intent: Intent?) {
            window.clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
            d(TAG, "clearFlags")
        }
    }
}

Desired goal:

1. Lock the screen turned ON (OK)
2. After 1 minute release it (NOK)

Here is the logcat with my debug notions:

2023-03-19 21:20:28.617 30730-30730 HelloWorld         com.example.helloworld   D  onCreate
2023-03-19 21:20:28.633 30730-30730 HelloWorld         com.example.helloworld   D  onResume
2023-03-19 21:25:47.935 30730-30730 HelloWorld         com.example.helloworld   D  clearFlags
2023-03-19 21:26:03.220 30730-30730 HelloWorld         com.example.helloworld   D  onPause

As you can see this alarm manager is everything but not exact.

Manifest contains the necessary permissions (based on my best knowledge):

<uses-permission android:name="android.permission.SCHEDULE_EXACT_ALARM" />
<uses-permission android:name="android.permission.WAKE_LOCK" />

So, how can I release the screen lock after 1 minute on WearOS?