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This seems sane to me, but needs a test.

Done

How fix this issue on old version like flutter 1.22.4

Which version is in effect?

I got the same crash after using FlutterFragment on flutter sdk2.10.3，product mode.

Fatal Exception: java.lang.ClassCastException
android.view.AbsSavedState$1 cannot be cast to io.flutter.embedding.android.FlutterSplashView$SavedState
io.flutter.embedding.android.FlutterSplashView.onRestoreInstanceState (FlutterSplashView.java:1)
android.view.View.dispatchRestoreInstanceState (View.java:19970)
android.view.ViewGroup.dispatchRestoreInstanceState (ViewGroup.java:3946)
android.view.ViewGroup.dispatchRestoreInstanceState (ViewGroup.java:3952)
android.view.View.restoreHierarchyState (View.java:19948)
com.android.internal.policy.PhoneWindow.restoreHierarchyState (PhoneWindow.java:2162)
android.app.Activity.onRestoreInstanceState (Activity.java:1602)
android.app.Activity.performRestoreInstanceState (Activity.java:1557)
android.app.Instrumentation.callActivityOnRestoreInstanceState (Instrumentation.java:1353)
android.app.ActivityThread.handleStartActivity (ActivityThread.java:3380)
android.app.servertransaction.TransactionExecutor.performLifecycleSequence (TransactionExecutor.java:221)
android.app.servertransaction.TransactionExecutor.cycleToPath (TransactionExecutor.java:201)
android.app.servertransaction.TransactionExecutor.executeLifecycleState (TransactionExecutor.java:173)
android.app.servertransaction.TransactionExecutor.execute (TransactionExecutor.java:97)
android.app.ActivityThread$H.handleMessage (ActivityThread.java:2073)
android.os.Handler.dispatchMessage (Handler.java:107)
android.os.Looper.loop (Looper.java:225)
android.app.ActivityThread.main (ActivityThread.java:7563)
java.lang.reflect.Method.invoke (Method.java)
com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:539)
com.android.internal.os.ZygoteInit.main (ZygoteInit.java:994)