Xamarin AndroidX WorkManager not working when app is killed

I'm trying to setup a WorkManager that executes a task every 15 minutes. For now I'm doing this test adding an entry in a firebase database.

I'm using the nuget package Xamarin.AndroidX.Work.Runtime (2.5.0.2)

This works fine if the app is in foreground or background, but if I kill the app it stops working.

I'm doing this test with a Nokia 8 Sirocco (api 28) and with a Samsung Galaxy A21S (api 30) that both mount Android Stock.

This is how I launch the work:

private void StartParallelWorkManager(int minutes)
    {
        PeriodicWorkRequest taskLauncher = PeriodicWorkRequest.Builder.From<UniquePeriodicWorker>(TimeSpan.FromMinutes(minutes)).Build();
        WorkManager.GetInstance(Xamarin.Essentials.Platform.AppContext).EnqueueUniquePeriodicWork("TestTask", ExistingPeriodicWorkPolicy.Keep, taskLauncher);
    }

and this is my Worker class:

public class UniquePeriodicWorker : Worker
    {
        public UniquePeriodicWorker(Context context, WorkerParameters workerParameters) : base(context, workerParameters)
        {
        }

        public override Result DoWork()
        {
            
            System.Console.WriteLine("{0} DO WORK", DateTime.Now.ToString("dd/MM HH:mm:ss"));
            try
            {
                _ = CrossCloudFirestore.Current
                             .Instance
                             .Collection("WorkManagerRuns")
                             .AddAsync<DateTime>(DateTime.Now);
            }
            catch(Exception ex)
            {
                System.Diagnostics.Debug.WriteLine(ex);
            }
            return Result.InvokeSuccess();
        }
    }

Doing the same test with native code in android studio works like a charm.

Am I missing something in Xamarin side or is Xamarin.AndroidX.Work.Runtime bugged? Any suggestion?