App crashes in iOS 13 on UnregisterAllAsync for Azure NotificationHubs

jmlumpkin

Pretty simple code works fine in iOS, but when working with the new previews for iOS 13, I get pretty hard crashes SIGSEGV with the following code:

Hub.UnregisterAllAsync(deviceToken, (error) =>
{
if (error != null)
{
System.Diagnostics.Debug.WriteLine("Error calling Unregister: {0}", error.ToString());
return;
}

                    string[] tags_array = AppDelegate.notificationTags.ToArray();
                    NSSet tags = new NSSet(tags_array);
                    Console.WriteLine($"tags after unmount: {tags}");

                    Hub.RegisterNativeAsync(deviceToken, tags, (errorCallback) =>
                    {
                        if (errorCallback != null)
                            System.Diagnostics.Debug.WriteLine("RegisterNativeAsync error: " + errorCallback);
                    });
                });

There is no update for Xamarin.Azure.NotificationHubs.iOS in the last couple of years. It only seems to affect iOS 13.

It looks like it hits SBNotificationHubHelper signString:withKeyData:keyLength, then crashes into native code. No breakpoints are hit