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The code you've provided so far never calls history.add(), so it's never actually adding a new history entry. If this really is the code you're using (I assumed it was just sample code to explain your problem), then maybe that's the issue?

Unless a new history entry is added, the back button will always return the user to the previous page rather than the previous history state.

initialState specifies the default state that should be used when a state hasn't been set yet, but it doesn't actually create a history entry. A history entry won't be created until you call add().