CallKeep auto close later 5 to 10 second on ios

I am doing push voip with callkeep. When the application is running or in the background. It works well. But when I kill it, the callkeep shows only 5 to 10 seconds then turns off by itself.
Version react-native-callkeep: 4.2.0 or 4.1.0
version react-native-voip-push-notification: 3.3.0 or 3.1.0

version react-native: 0.63.4

im running on Ipad, version padOS: 14.7.1

AppDelegate.m

// --- Handle updated push credentials

• (void)pushRegistry:(PKPushRegistry *)registry didUpdatePushCredentials:(PKPushCredentials *)credentials forType:(PKPushType)type {
  // Register VoIP push token (a property of PKPushCredentials) with server
  [RNVoipPushNotificationManager didUpdatePushCredentials:credentials forType:(NSString *)type];
  }

• (void)pushRegistry:(PKPushRegistry *)registry didInvalidatePushTokenForType:(PKPushType)type
  {
  // --- The system calls this method when a previously provided push token is no longer valid for use. No action is necessary on your part to reregister the push type. Instead, use this method to notify your server not to send push notifications using the matching push token.
  }

• (void)pushRegistry:(PKPushRegistry *)registry didReceiveIncomingPushWithPayload:(PKPushPayload *)payload forType:(PKPushType)type withCompletionHandler:(void (^)(void))completion {
  // Process the received push
  NSDictionary *custom = [payload.dictionaryPayload valueForKey:@"custom"];
  NSLog(@"custom123123123");
  NSLog(@"%@", custom);
  NSDictionary *a = [custom valueForKey:@"a"];
  NSString *uuid = [a valueForKey:@"uuid"];
  NSString *domain = [a valueForKey:@"domain"];
  NSString *token = [a valueForKey:@"token"];
  NSString *room = [a valueForKey:@"room"];
  NSString *mobile = [a valueForKey:@"mobile"];

  [RNVoipPushNotificationManager addCompletionHandler:uuid completionHandler:completion];

  // --- Process the received push
  [RNVoipPushNotificationManager didReceiveIncomingPushWithPayload:payload forType:(NSString *)type];

  [RNCallKeep reportNewIncomingCall: uuid
  handle: mobile
  handleType: @"generic"
  hasVideo: NO
  localizedCallerName: room
  supportsHolding: YES
  supportsDTMF: YES
  supportsGrouping: YES
  supportsUngrouping: YES
  fromPushKit: YES
  payload: custom
  withCompletionHandler: completion];
  }
  

Start with AppDelegate.m, especially the PushKit didReceiveIncomingPushWithPayload callback and its RNCallKeep reportNewIncomingCall flow. Reproduce the issue with the application terminated on iPadOS 14.7.1; done means the CallKeep incoming call does not close after 5 to 10 seconds.