AltBeacon Lib can not detect beacons

I have 2 beacons nearby, and the manufacturer indicates their UUID are all the same of:

beacon uuid: fda50693-a4e2-4fb1-afcf-c6eb07647825

by using the direct Android API, I can constantly(every seconds) see the beacon mac and scanRecord via:

ScanCallback leScanCallback =
    new ScanCallback() {
        @Override
        public void onScanResult(int callbackType, ScanResult result) {
            super.onScanResult(callbackType, result);
            // scanned result data bytes sample:onScanResult-> deviceName: R24110120, rssi: -52, 
            // deviceMacAddress: 52:0A:24:11:00:78, 
            //scanRecord: 0201061aff4c000215fda50693a4e24fb1afcfc6eb0764782500010002d80a0952323431313031323011160318520a24110078000100020603e864000000
        }
};
var bluetoothLeScanner = BluetoothAdapter.getDefaultAdapter().getBluetoothLeScanner();
var bluetoothLeScanner = BluetoothAdapter.getDefaultAdapter().getBluetoothLeScanner();
            ScanSettings settings = new ScanSettings.Builder().build();
            ScanFilter scanFilter = new ScanFilter.Builder().build();
            ArrayList<ScanFilter> scanFilters = new ArrayList<>();
            scanFilters.add(scanFilter);
            bluetoothLeScanner.startScan(scanFilters, settings, leScanCallback);

while if I choose the library for scanning:

beaconManager = BeaconManager.getInstanceForApplication(this);
// To detect proprietary beacons, you must add a line like below corresponding to yo
// type.  Do a web search for "setBeaconLayout" to get the proper expression.
beaconManager.getBeaconParsers().add(new BeaconParser().
        setBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24"));
beaconManager.addMonitorNotifier(new MonitorNotifier() {
    @Override
    public void didEnterRegion(Region region) {
        var regionLogStr = String.format("didEnterRegion: %s", region.toString());
        Log.i(TAG, "onScanResult - I just saw an beacon for the first time! - " + re
    }
    @Override
    public void didExitRegion(Region region) {
        Log.i(TAG, "onScanResult - I no longer see an beacon");
    }
    @Override
    public void didDetermineStateForRegion(int state, Region region) {
        var regionLogStr = String.format("didDetermineStateForRegion: %s, mac: %s", region.toString(), region.getBluetoothAddress());
        Log.i(TAG, "onScanResult - I have just switched from seeing/not seeing beacons: " + state + " - " + regionLogStr);
    }
});
beaconManager.startMonitoring(new Region("myMonitoringUniqueId", null, null, null));

I could never have any of that callback: didEnterRegion hit, only the didDetermineStateForRegion get called when app just started with logging:

onScanResult - I have just switched from seeing/not seeing beacons: 0 - didDetermineStateForRegion: id1: null id2: null id3: null, mac: null

what could be wrong here?

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