[Flutter] onPopInvokedWithResult being called twice

I have a PopScope that handles some cleanup, but for some reason, the onPopInvokedWithResult callback is being called twice.

How can this happen?

@immutable
class MyRoute extends GoRouteData {

const MyRoute({
// ...
});

@override
Page buildPage(BuildContext context, GoRouterState state) => MaterialPage(
key: state.pageKey,
child: PopScope(
child: MyPageWithScaffold(
// ...
),
onPopInvokedWithResult: (didPop, result) {
if (didPop) {
doCleanup();
}
},
),
);
}

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