iOS Beacon monitoring - RegionLeft is not fired - ios

Question

I implemented the CLLocationManager.StartMonitoring() method. The CLLocationManager.EnterRegion is fired when the beacon comes into the range of the phone, however the RegionLeft does not get called when the Beacon is outside of the range of the phone again. I use the following code:
public void StartWakeupForBeacon()
{
//NSOperationQueue.MainQueue.AddOperation(() =>
//{
string message = "";
CLProximity previousProximity = CLProximity.Far;
var userId = ServiceLocator.Instance.Get<IAccountStoreService>().GetAccountUserId();
var tupple = UtilHelper.GetMajorMinorFromUserId(userId);
var major = tupple.Item1;
var minor = tupple.Item2;
var beaconUuid = UuidHelper.BeaconUuidString;
BeaconRegion = new CLBeaconRegion(new NSUuid(beaconUuid), (ushort)major, (ushort)minor, "com.example.company");
BeaconRegion.NotifyEntryStateOnDisplay = true;
BeaconRegion.NotifyOnExit = true;
BeaconRegion.NotifyOnEntry = true;
LocationManager = new CLLocationManager();
LocationManager.RequestAlwaysAuthorization();
LocationManager.RegionEntered += (object sender, CLRegionEventArgs e) =>
{
Console.WriteLine("region entered");
var btService = ServiceLocator.Instance.Get<IBluetoothService>();
ServiceLocator.Instance.Get<ILoggingService>().LogEvent(LoggingService.BeaconRegionEnteredEvent);
btService.ExchangeData();
};
LocationManager.RegionLeft += (object sender, CLRegionEventArgs e) =>
{
Console.WriteLine("region left");
ServiceLocator.Instance.Get<ILoggingService>().LogEvent(LoggingService.BeaconRegionLeftEvent);
};
LocationManager.DidDetermineState += (object sender, CLRegionStateDeterminedEventArgs e) =>
{
switch (e.State)
{
case CLRegionState.Inside:
Console.WriteLine("region state inside");
break;
case CLRegionState.Outside:
Console.WriteLine("region state outside");
break;
case CLRegionState.Unknown:
Console.WriteLine("region unknown");
break;
default:
Console.WriteLine("region state unknown");
break;
}
};
LocationManager.DidStartMonitoringForRegion += (object sender, CLRegionEventArgs e) =>
{
LocationManager.RequestState(e.Region);
string t_region = e.Region.Identifier.ToString();
Console.WriteLine(t_region);
};
LocationManager.DidRangeBeacons += (object sender, CLRegionBeaconsRangedEventArgs e) =>
{
if (e.Beacons.Length > 0)
{
CLBeacon beacon = e.Beacons[0];
switch (beacon.Proximity)
{
case CLProximity.Immediate:
message = "Immediate";
break;
case CLProximity.Near:
message = "Near";
break;
case CLProximity.Far:
message = "Far";
break;
case CLProximity.Unknown:
message = "Unknown";
//SendNotication();
break;
}
if (previousProximity != beacon.Proximity)
{
Console.WriteLine(message);
}
previousProximity = beacon.Proximity;
}
else
{
Console.WriteLine("nothing");
}
};
LocationManager.StartMonitoring(BeaconRegion);
LocationManager.MonitoringFailed += (sender, e) =>
{
System.Diagnostics.Debug.WriteLine("Failed monitoring");
};
LocationManager.StartRangingBeacons(BeaconRegion);
//});
}
When the Beacon is out of range of the phone, I can see that this is recognized by the app, since DidRangeBeacon does not recognize any beacon anymore and prints "nothing" to the console.
Additionally I get weird device logs regarding the location manager, it basically spams the following warning:
#Warning Tried injecting when not running