firebase-ios-sdk: FCM Token not updating latest iOS13.5 and Xcode 11.5

Hi Team,

Firebase suddenly stop updating the fcm token. It’s always giving a same token, Even i uninstall the app and check it on several times, but it’s always giving the same token. My two iOS apps was working properly but last 1 weeks it’s giving the issue. When i am trying to send notification on that token its saying that “NotRegistered” Response

{“multicast_id”:1896555360655138060,“success”:0,“failure”:1,“canonical_ids”:0,“results”:[{“error”:“NotRegistered”}]}.

Step 0: Are you in the right place?

• For issues or feature requests related to the code in this repository file a Github issue.
  • If this is a feature request please use the Feature Request template.
• For general technical questions, post a question on StackOverflow with the firebase tag.
• For general (non-iOS) Firebase discussion, use the firebase-talk google group.
• For backend issues, console issues, and other non-SDK help that does not fall under one of the above categories, reach out to Firebase Support.
• Once you’ve read this section and determined that your issue is appropriate for this repository, please delete this section.

[REQUIRED] Step 1: Describe your environment

• Xcode version: 11.5
• Swift Version 5.2 with iOS 13.5
• Firebase SDK version: latest version
• Firebase Component: Messaging (Auth, Core, Database, Firestore, Messaging, Storage, etc)
• Component version: latest version
• Installation method: CocoaPods CocoaPods | Carthage | Zip file (select one)

[REQUIRED] Step 2: Describe the problem

      Install the app and allow the notification you will get the token. Now save that token in 
      some where else and uninstall the app in device and again install the same app. You will get 
      the exact same token as you install app on first time. And you try to send notification on that 
      token api give below response. I have done the install and uninstall several times but same 
      token coming always.

     {"multicast_id":1896555360655138060,"success":0,"failure":1,"canonical_ids":0,"results": 
    [{"error":"NotRegistered"}]}.

Steps to reproduce:

What happened? How can we make the problem occur? This could be a description, log/console output, etc.

If you have a downloadable sample project that reproduces the bug you’re reporting, you will likely receive a faster response on your issue.

########## Create the new project Xcode11.5 download the fcm sample code and integrate the same in newly created app. Install the app in device. You will get the token, now uninstall the app and install again you will get the same token again. now use that token to send notification it will gives a error.

Relevant Code:

// TODO(you): code here to reproduce the problem

    // Added this on didFinishLaunchingWithOptions function

      Messaging.messaging().delegate = self
      Messaging.messaging().shouldEstablishDirectChannel = false

    UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge]) {
        (granted, error) in
        //Parse errors and track state
        debugPrint("notification=\(granted)")
        DispatchQueue.main.async {
            if granted {
                debugPrint("granted")
            }
        }
    }
    
    application.registerForRemoteNotifications()



  //FCM Delegate method
   func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String) {
          print("Firebase registration token: \(fcmToken)")
   }