Cupertino navigation bar middle overflow

main.dart

import 'package:flutter/cupertino.dart';

void main() {
  runApp(
    CupertinoApp(
      home: CupertinoPageScaffold(
        navigationBar: CupertinoNavigationBar(
          middle: Column(children: [
            Text('My page'),
            CupertinoSlidingSegmentedControl<int>(
              onValueChanged: (value) {},
              children: {
                0: Text('Foo'),
                1: Text('Bar'),
              },
            )
          ]),
        ),
        child: Text('Hello world'),
      ),
    ),
  );
}