UWP app crashes while performing an async method - exception

Question

I have created two methods in my BaseViewModel (MVVMLight App) to perform any async code with some logic:
public async Task PerformOperation(Func<Task> action)
{
IsBusy = true;
try
{
await action?.Invoke();
}
catch(Exception ex)
{
// logging is here
}
finally
{
IsBusy = false;
}
}
public async Task PerformOperation(params Operation[] actions)
{
IsBusy = true;
MultipleOperatrions = true;
OperationStatuses = new ObservableCollection<OperationStatus>();
try
{
foreach(var action in actions)
{
var status = new OperationStatus() { StatusText = action.StatusText };
OperationStatuses.Add(status);
try
{
await action?.AsyncAction();
status.Success = true;
}
catch
{
status.Success = false;
}
finally
{
status.IsFinished = true;
}
}
}
catch (Exception ex)
{
// logging is here
}
finally
{
await Task.Delay(1000);
IsBusy = false;
MultipleOperatrions = false;
OperationStatuses = new ObservableCollection<OperationStatus>();
}
}
My models:
public class Operation
{
public Func<Task> AsyncAction { get; private set; }
public string StatusText { get; private set; }
public Operation(Func<Task> action, string statusText)
{
AsyncAction = action;
StatusText = statusText;
}
}
My code of calling the methods in the view model:
...
private IAsyncCommand _buildCommand;
public IAsyncCommand BuildCommand => _buildCommand ?? (_buildCommand = new AsyncCommand(Build));
#endregion
#region Methods
public async Task Build()
{
// IT WORKS
// this method is used for performing only a single operation
// await PerformOperation(async () => { await Task.Delay(3000); });
// IT CRASHES THE APP
// for many tasks
await PerformOperation(new Operation(async () => { await Task.Delay(3000); }, "Preparing..."));
}
...
So, if I call PerformOperation to call just only a single method - it works fine. But it doesn't for the method of performing of several operations - the application just crashes without any exception or messages. I subscribed in App.cs to UnhandledException event to catch it but the app just crashes.