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Android multiple flutters sample can crash when navigating back through stack #762

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@xster

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@xster

Navigate forward until the single or double activity loops through twice, then start popping activities. When it gets to the first occurrence of the single/double activity,

Caused by: java.lang.IllegalStateException: The requested cached FlutterEngine did not exist in the FlutterEngineCache: '0'
        at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.setupFlutterEngine(FlutterActivityAndFragmentDelegate.java:218)
        at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.onAttach(FlutterActivityAndFragmentDelegate.java:155)
        at io.flutter.embedding.android.FlutterFragment.onAttach(FlutterFragment.java:608)
        at androidx.fragment.app.Fragment.performAttach(Fragment.java:2574)
        at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:828)
        at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManagerImpl.java:1238)
        at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:1303)
        at androidx.fragment.app.FragmentManagerImpl.dispatchStateChange(FragmentManagerImpl.java:2659)
        at androidx.fragment.app.FragmentManagerImpl.dispatchCreate(FragmentManagerImpl.java:2607)
        at androidx.fragment.app.FragmentController.dispatchCreate(FragmentController.java:235)
        at androidx.fragment.app.FragmentActivity.onCreate(FragmentActivity.java:316)
        at dev.flutter.multipleflutters.DoubleFlutterActivity.onCreate(DoubleFlutterActivity.kt:25)
        at android.app.Activity.performCreate(Activity.java:8000)
        at android.app.Activity.performCreate(Activity.java:7984)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309)

and the counter number resets.

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