[iOS 27 Beta] Tapping TextFormField in Release/TestFlight build unexpectedly overlays launch/splash screen


## Context / Attempts to Fix
* **UISceneDelegate Migration:** We initially suspected this could be related to recent iOS windowing and lifecycle changes, so we fully implemented and adopted `UISceneDelegate` in our iOS runner. However, the exact same behavior persists even after ensuring a correct `UISceneDelegate` setup.
* 
### Steps to reproduce

1. Distribute the Flutter application via TestFlight (Release configuration) to a device running iOS 27 Beta.
2. Launch the application and navigate to any screen containing a text entry field.
3. Tap on the `TextField` or `TextFormField`.
4. Observe that the launch/splash screen unexpectedly appears and overlays the view.

### Expected results

Tapping the text field should focus the input, display the text cursor, and bring up the iOS soft keyboard normally without any visual glitches or splash screen overlays.

### Actual results

Upon tapping the text field in Release/TestFlight mode on iOS 27 Beta, the application immediately overlays the splash screen for a few seconds. After this brief period, it returns to the active view. This does not happen when debugging the application locally.

### Code sample

<details open><summary>Code sample</summary>

```dart
import 'package:flutter/material.dart';

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      home: Scaffold(
        body: Center(
          child: Padding(
            padding: EdgeInsets.all(16.0),
            // Render basic isolated component
            child: InputTextGW(placeholder: 'Tap here to trigger issue'),
          ),
        ),
      ),
    );
  }
}

class InputTextGW extends StatefulWidget {
  const InputTextGW({
    super.key,
    required this.placeholder,
    this.controller,
    this.focusNode,
  });

  final String placeholder;
  final TextEditingController? controller;
  final FocusNode? focusNode;

  @override
  State<InputTextGW> createState() => _InputTextGWState();
}

class _InputTextGWState extends State<InputTextGW> {
  late final FocusNode _focusNode;
  late final TextEditingController _controller;

  @override
  void initState() {
    super.initState();
    _focusNode = widget.focusNode ?? FocusNode();
    _controller = widget.controller ?? TextEditingController();
  }

  @override
  void dispose() {
    if (widget.focusNode == null) _focusNode.dispose();
    if (widget.controller == null) _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisSize: MainAxisSize.min,
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        TextFormField(
          controller: _controller,
          focusNode: _focusNode,
          decoration: InputDecoration(
            hintText: widget.placeholder,
            filled: true,
          ),
        ),
      ],
    );
  }
}
```

### Logs

<details open><summary>Logs</summary>

console

NO LOGS


</details>

### Media

<details open><summary>Video</summary>


https://github.com/user-attachments/assets/b57307cc-1962-4732-9584-b4fc3f444984


</details>



### Flutter Doctor output

<details open><summary>Doctor output</summary>

```console
[✓] Flutter (Channel stable, 3.44.1, on macOS 26.5 25F71 darwin-arm64, locale es-MX) [11.1s]
    • Flutter version 3.44.1 on channel stable at /opt/homebrew/Caskroom/flutter/3.32.5/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 924134a44c (13 days ago), 2026-05-29 12:13:22 -0400
    • Engine revision c416acfeb8
    • Dart version 3.12.1
    • DevTools version 2.57.0
    • Feature flags: enable-web, enable-linux-desktop, enable-macos-desktop, enable-windows-desktop, enable-android, enable-ios, cli-animations, enable-native-assets,
      no-enable-swift-package-manager, omit-legacy-version-file, enable-lldb-debugging, enable-uiscene-migration

[✓] Android toolchain - develop for Android devices (Android SDK version 36.0.0) [14.6s]
    • Android SDK at /Users/usuario/Library/Android/sdk
    • Emulator version 35.4.9.0 (build_id 13025442) (CL:N/A)
    • Platform android-36, build-tools 36.0.0
    • ANDROID_HOME = /Users/usuario/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
      This is the JDK bundled with the latest Android Studio installation on this machine.
      To manually set the JDK path, use: `flutter config --jdk-dir="path/to/jdk"`.
    • Java version OpenJDK Runtime Environment (build 21.0.6+-13355223-b631.42)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 26.5) [22.2s]
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 17F42
    • CocoaPods version 1.16.2

[✓] Chrome - develop for the web [7ms]
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Connected device (4 available) [20.5s]
    • iPhone Crediclub (wireless) (mobile) •  XXXXXXXXXX    • ios            • iOS 27.0 24A5355q
    • iphone se 3rd (mobile)               • XXXXXXXXXX            • ios            • com.apple.CoreSimulator.SimRuntime.iOS-26-1 (simulator)
    • macOS (desktop)                      • macos                                • darwin-arm64   • macOS 26.5 25F71 darwin-arm64
    • Chrome (web)                         • chrome                               • web-javascript • Google Chrome 149.0.7827.103

[✓] Network resources [331ms]
    • All expected network resources are available.

• No issues found!
```

</details>


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Uh oh!

[iOS 27 Beta] Tapping TextFormField in Release/TestFlight build unexpectedly overlays launch/splash screen #187844

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Uh oh!

[iOS 27 Beta] Tapping TextFormField in Release/TestFlight build unexpectedly overlays launch/splash screen #187844

Description

Context / Attempts to Fix

Steps to reproduce

Expected results

Actual results

Code sample

Logs

Media

Flutter Doctor output

Metadata

Metadata

Assignees

Labels

Type

Fields

Projects

Milestone

Relationships

Development

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