Repository: flutter
Issue: TextFormField reset works only for the first time
Labels: a: text input,framework,f: material design,has reproducible steps,found in release: 3.0,found in release: 3.1,team-design,triaged-design

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## Steps to Reproduce

<!-- Please include full steps to reproduce so that we can reproduce the problem. -->

1. Execute `flutter run` on the code sample or on dart pad <!-- (see "Code sample" section below) -->
2. Enter some text inside textInput (like 123)
3. Press submit
4. Text is well reset
5. Enter again some text inside textInput (like 456)
6. Press submit again
7. Text is not well reset

```dart
FocusScope.of(context).requestFocus(FocusNode());  // TextFormField initialValue seems register controller.value to default and broke the next reset.
_formKey.currentState?.reset();
```

**Expected results:** <!-- what did you want to see? -->
TextInput should reset
**Actual results:** <!-- what did you see? -->
TextInput is not reset
<details>
<summary>Code sample</summary>

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      Without this we will unlikely be able to progress on the issue, and because of that
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```dart
import 'package:flutter/material.dart';

const Color darkBlue = Color.fromARGB(255, 18, 32, 47);

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData.dark().copyWith(
        scaffoldBackgroundColor: darkBlue,
      ),
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: Center(
          child: MyWidget(),
        ),
      ),
    );
  }
}

class MyWidget extends StatefulWidget {
  @override
  State<MyWidget> createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  final GlobalKey<FormState> _formKey = GlobalKey<FormState>();

  final TextEditingController controller = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return Form(
    
    key: _formKey,
        autovalidateMode: AutovalidateMode.onUserInteraction,
      child: Column(
      children: [
        TextFormField(
          controller: controller,
        ),
        ElevatedButton(
          onPressed: () {
            
            FocusScope.of(context).requestFocus(FocusNode()); 
            _formKey.currentState?.reset();
          },
        child: const Text("submit"),
        ), 
      ],)
    );
  }
}

```

</details>

<details>
  <summary>Logs</summary>

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      log output below between the lines with the backticks. If there is an
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```
```

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     Run `flutter analyze` and attach any output of that command below.
     If there are any analysis errors, try resolving them before filing this issue.
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```
```

<!-- Finally, paste the output of running `flutter doctor -v` here. -->

Issue reproductible on dart pad.
![Capture d’écran 2022-05-30 à 17 22 10](https://user-images.githubusercontent.com/92172436/171022482-c25a2e6e-72d5-42a9-b1e3-adc83d2f2aeb.png)
</details>


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