Component used: Activity (1.0.0-alpha04), Fragment (1.1.0-alpha04), Navigation (1.0.0-rc02)
Devices/Android versions reproduced on: Pixel 2 XL emulator, SDK 28

When using the @ContentView on my Activity alongside the Navigation lib, if you background the app, terminate it using Android Studio, and then re-open it from recents you receive an IllegalArgumentException and something along the lines of the following as a stacktrace:

2019-03-04 22:49:11.338 16838-16838/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.mikescamell.fragmentcrashtest, PID: 16838
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mikescamell.fragmentcrashtest/com.mikescamell.fragmentcrashtest.MainActivity}: java.lang.IllegalArgumentException: Fragment NavHostFragment{504d1a8 (b3220214-5197-4fdf-9204-7069fb9e014a) id=0x7f08008d} is not an active fragment of FragmentManager FragmentManager{adea4c1 in HostCallbacks{5452466}}
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: java.lang.IllegalArgumentException: Fragment NavHostFragment{504d1a8 (b3220214-5197-4fdf-9204-7069fb9e014a) id=0x7f08008d} is not an active fragment of FragmentManager FragmentManager{adea4c1 in HostCallbacks{5452466}}
at androidx.fragment.app.FragmentManagerImpl.setPrimaryNavigationFragment(FragmentManagerImpl.java:2757)
at androidx.fragment.app.BackStackRecord.executeOps(BackStackRecord.java:674)
at androidx.fragment.app.FragmentManagerImpl.executeOps(FragmentManagerImpl.java:2069)
at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManagerImpl.java:1859)
at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManagerImpl.java:1814)
at androidx.fragment.app.FragmentManagerImpl.execPendingActions(FragmentManagerImpl.java:1721)
at androidx.fragment.app.FragmentManagerImpl.dispatchStateChange(FragmentManagerImpl.java:2623)
at androidx.fragment.app.FragmentManagerImpl.dispatchCreate(FragmentManagerImpl.java:2573)
at androidx.fragment.app.FragmentController.dispatchCreate(FragmentController.java:236)
at androidx.fragment.app.FragmentActivity.onCreate(FragmentActivity.java:304)
at androidx.appcompat.app.AppCompatActivity.onCreate(AppCompatActivity.java:85)
at com.mikescamell.fragmentcrashtest.MainActivity.onCreate(MainActivity.kt:17)
at android.app.Activity.performCreate(Activity.java:7136)
at android.app.Activity.performCreate(Activity.java:7127)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

I've attached a project that can replicate this.

Reproduction steps:

1. Open app
2. Background the app
3. Terminate the application using Android Studio
4. Reopen the app using recents

I've been able to fix this by simply going back to using the setContentView function after the super call in onCreate.