title: Combine and NotificationCenter: Notifications not working
body: <p>I wrote a very simple app to test Combine and the NotificationCenter:</p>
  
  <pre><code>
  extension Notification.Name {
      static let Test = Notification.Name(rawValue: "Test")
  }
  
  // SOLUTION 1
  NotificationCenter.default
              .publisher(for: .Test)
              .sink(receiveCompletion: { _ in
                  print("SOLUTION 1: COMPLETION")
              }, receiveValue: { _ in
                  print("SOLUTION 1: VALUE")
              })
  
  // SOLUTION 2
      NotificationCenter.Publisher(center: .default, name: .Test)
          .sink(receiveCompletion: { _ in
              print("SOLUTION 2: COMPLETION")
          }, receiveValue: { _ in
              print("SOLUTION 2: VALUE")
          })
  
  // SOLUTION 3
  NotificationCenter.default.addObserver(self, selector: #selector(doSomething), name: .Test, object: nil)
  
  @objc
  func doSomething() {
          print("SOLUTION 3: VALUE")
  }
  
  // RAISE NOTIFICATION
  
  NotificationCenter.default.post(name: .Test, object: nil)NotificationCenter.default.post(name: .Test, object: nil)
  </code></pre>
  
  <p>Notifications aren't catched using Combine. The only solution working is the third one, the old-style one. The weird thing is that if I run the same code in the Playground, it works!</p>
  
  <p>The deployment target for the project is iOS 13. I've executed the app on both a physical device and simulator. I've also installed iOS 13.2.2 simulator.</p>
  
  <p>Any suggestion?</p>