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Having same error after updating to alpha02. I don't have a subgraph.

To demonstrate,

Fragment A ------> Fragment B ------> Fragment C

- A to B action is marked as clear task and it works properly, onNavigated method triggered with correct destinationId.
- B to C action is not marked a clear task, it does not trigger onNavigated method with correct destinationId. While navigateUp method returns to B, trying to navigate to C again causes a crash.

I have the same issue:
Reported Issue
Component used: android.arch.navigation:navigation-fragment-ktx
Version used: 1.0.0-alpha02
The same navigation flow worked in 1.0.0-alpha01
My navigation resource:
<navigation
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/newTicketActivityNav"
    app:startDestination="@id/mapFragment">

    <fragment
        android:id="@+id/mapFragment"
        android:name=".views.MapFragment"
        android:label="@string/processus_new_ticket"
        tools:layout="@layout/fragment_map">
        <action
            android:id="@+id/action_mapFragment_to_operationFragment"
            app:destination="@id/operationFragment" />
    </fragment>

    <fragment
        android:id="@+id/operationFragment"
        android:name=".views.OperationFragment"
        android:label="@string/processus_new_ticket"
        tools:layout="@layout/fragment_operation">
        <action
            android:id="@+id/action_operationFragment_to_ticketOverviewFragment"
            app:destination="@id/ticketOverviewFragment"
            app:popUpTo="@+id/mapFragment" />
    </fragment>

    <fragment
        android:id="@+id/ticketOverviewFragment"
        android:name=".views.TicketOverviewFragment"
        android:label="@string/processus_new_ticket"
        tools:layout="@layout/fragment_ticket_overview">
        <action
            android:id="@+id/action_ticketOverviewFragment_to_ticketFragment"
            app:destination="@id/ticketFragment"
            app:popUpTo="@+id/mapFragment" />
    </fragment>
    <fragment
        android:id="@+id/ticketFragment"
        android:name=".views.TicketFragment"
        android:label="@string/processus_new_ticket"
        tools:layout="@layout/fragment_ticket" />
</navigation>

Device info used for issue: samsung SM-G955U, Android 8.0.0

Exception got:
Fatal Exception: java.lang.IllegalArgumentException
navigation destination co.opensi.sogelibmobilegfa:id/action_ticketOverviewFragment_to_ticketFragment is unknown to this NavController
androidx.navigation.NavController.navigate (NavController.java:633)
androidx.navigation.NavController.navigate (NavController.java:592)
androidx.navigation.NavController.navigate (NavController.java:580)
co.opensi.sogelibmobilegfa.views.TicketOverviewFragment$onActivityCreated$5$1.onChanged (TicketOverviewFragment.kt:84)
co.opensi.sogelibmobilegfa.views.TicketOverviewFragment$onActivityCreated$5$1.onChanged (TicketOverviewFragment.kt:23)
android.arch.lifecycle.LiveData.considerNotify (LiveData.java:109)
android.arch.lifecycle.LiveData.dispatchingValue (LiveData.java:126)
android.arch.lifecycle.LiveData.setValue (LiveData.java:282)
android.arch.lifecycle.MutableLiveData.setValue (MutableLiveData.java:33)
.utils.NetworkBoundResource.setValue (Repository.kt:87)
.utils.NetworkBoundResource.access$setValue (Repository.kt:67)
.utils.NetworkBoundResource$fetchFromNetwork$$inlined$with$lambda$2$1$1$1.onChanged (Repository.kt:111)
android.arch.lifecycle.MediatorLiveData$Source.onChanged (MediatorLiveData.java:152)
android.arch.lifecycle.LiveData.considerNotify (LiveData.java:109)
android.arch.lifecycle.LiveData.dispatchingValue (LiveData.java:126)
android.arch.lifecycle.LiveData.setValue (LiveData.java:282)
android.arch.lifecycle.MutableLiveData.setValue (MutableLiveData.java:33)
android.arch.lifecycle.Transformations$1.onChanged (Transformations.java:70)
android.arch.lifecycle.MediatorLiveData$Source.onChanged (MediatorLiveData.java:152)
android.arch.lifecycle.LiveData.considerNotify (LiveData.java:109)
android.arch.lifecycle.LiveData.dispatchingValue (LiveData.java:126)
android.arch.lifecycle.LiveData.setValue (LiveData.java:282)
android.arch.lifecycle.LiveData$1.run (LiveData.java:87)
android.os.Handler.handleCallback (Handler.java:789)
android.os.Handler.dispatchMessage (Handler.java:98)
android.os.Looper.loop (Looper.java:164)
android.app.ActivityThread.main (ActivityThread.java:6938)
java.lang.reflect.Method.invoke (Method.java)
com.android.internal.os.Zygote$MethodAndArgsCaller.run (Zygote.java:327)
com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1374)

It is indeed the same root cause as the other issue.

Any work arounds at the moment?

Bug 110178671 was marked as fixed but this bug is reproducible in the latest build alpha04

I've been experiencing a similar bug for awhile now on alpha02 and alpha04. I can't reproduce it reliably, it just seems random. I can navigate via an action multiple times with no issues but then will randomly encounter this exact same exception for seemingly no reason.

Any suggestions or workarounds yet?

In my experience, the Google team doesn't tend to reply to issues once they are closed or fixed. I'm not expecting any further activity on this report.

#6, I'd recommend opening a new bug report.
#7, are you sure that it's a bug? If so, create a minimal example and open a new bug report. If not, post to Stack Overflow and get some feedback.

For what it's worth, I was affected by this bug and it was fixed for me in alpha04.

This bug has been fixed for me in alpha05, probably by bugfix: https://issuetracker.google.com/issues/111907708

Yep, file a new issue with a project that reproduces your issue if you're still having issues on alpha05. Thanks!