IssueTracker

When attempting to navigate through a nested graph more than twice the application crashes with the following exception:

```
E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.jetpacknavigationtest, PID: 6203
    java.lang.IllegalArgumentException: navigation destination com.example.jetpacknavigationtest:id/action_page1Fragment_to_page2Fragment is unknown to this NavController
        at androidx.navigation.NavController.navigate(NavController.java:693)
        at androidx.navigation.NavController.navigate(NavController.java:650)
        at androidx.navigation.NavController.navigate(NavController.java:636)
        at androidx.navigation.Navigation$1.onClick(Navigation.java:118)
        at android.view.View.performClick(View.java:6294)
        at android.view.View$PerformClick.run(View.java:24770)
        at android.os.Handler.handleCallback(Handler.java:790)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6494)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
```

This may be related to
https://issuetracker.google.com/110178671, that has been marked as fixed but the crash persists in `1.0.0-alpha07`.

Component used:
android.arch.navigation:navigation-fragment-ktx:1.0.0-alpha07
android.arch.navigation:navigation-ui-ktx:1.0.0-alpha07

Version used:
Shown above

Devices/Android versions reproduced on:
Android_Accelerated_x86_Oreo.avd

If this is a bug in the library, we would appreciate if you could attach:
- Sample project to trigger the issue.
Sample app: https://github.com/andre-artus/JetpackNavigationTest
Checkout /tree/1.0.0-alpha07

- A screenrecord or screenshots showing the issue (if UI related).