diff --git a/lib/ui/platform_dispatcher.dart b/lib/ui/platform_dispatcher.dart
index 5f276f836343d..90112aad40f78 100644
--- a/lib/ui/platform_dispatcher.dart
+++ b/lib/ui/platform_dispatcher.dart
@@ -977,7 +977,8 @@ class PlatformDispatcher {
   /// This option is used by [EditableTextState] to define its
   /// [SpellCheckConfiguration] when a default spell check service
   /// is requested.
-  bool get nativeSpellCheckServiceDefined => configuration.nativeSpellCheckServiceDefined;
+  bool get nativeSpellCheckServiceDefined => _nativeSpellCheckServiceDefined;
+  bool _nativeSpellCheckServiceDefined = false;
 
   /// Whether briefly displaying the characters as you type in obscured text
   /// fields is enabled in system settings.
@@ -986,7 +987,8 @@ class PlatformDispatcher {
   ///
   ///  * [EditableText.obscureText], which when set to true hides the text in
   ///    the text field.
-  bool get brieflyShowPassword => configuration.brieflyShowPassword;
+  bool get brieflyShowPassword => _brieflyShowPassword;
+  bool _brieflyShowPassword = true;
 
   /// The setting indicating the current brightness mode of the host platform.
   /// If the platform has no preference, [platformBrightness] defaults to
@@ -1040,8 +1042,16 @@ class PlatformDispatcher {
     final double textScaleFactor = (data['textScaleFactor']! as num).toDouble();
     final bool alwaysUse24HourFormat = data['alwaysUse24HourFormat']! as bool;
     final bool? nativeSpellCheckServiceDefined = data['nativeSpellCheckServiceDefined'] as bool?;
+    if (nativeSpellCheckServiceDefined != null) {
+      _nativeSpellCheckServiceDefined = nativeSpellCheckServiceDefined;
+    } else {
+      _nativeSpellCheckServiceDefined = false;
+    }
     // This field is optional.
     final bool? brieflyShowPassword = data['brieflyShowPassword'] as bool?;
+    if (brieflyShowPassword != null) {
+      _brieflyShowPassword = brieflyShowPassword;
+    }
     final Brightness platformBrightness =
     data['platformBrightness']! as String == 'dark' ? Brightness.dark : Brightness.light;
     final String? systemFontFamily = data['systemFontFamily'] as String?;
@@ -1058,8 +1068,6 @@ class PlatformDispatcher {
     _configuration = previousConfiguration.copyWith(
       textScaleFactor: textScaleFactor,
       alwaysUse24HourFormat: alwaysUse24HourFormat,
-      nativeSpellCheckServiceDefined: nativeSpellCheckServiceDefined ?? false,
-      brieflyShowPassword: brieflyShowPassword,
       platformBrightness: platformBrightness,
       systemFontFamily: systemFontFamily,
     );
@@ -1247,8 +1255,6 @@ class PlatformConfiguration {
     this.semanticsEnabled = false,
     this.platformBrightness = Brightness.light,
     this.textScaleFactor = 1.0,
-    this.nativeSpellCheckServiceDefined = false,
-    this.brieflyShowPassword = true,
     this.locales = const <Locale>[],
     this.defaultRouteName,
     this.systemFontFamily,
@@ -1261,8 +1267,6 @@ class PlatformConfiguration {
     bool? semanticsEnabled,
     Brightness? platformBrightness,
     double? textScaleFactor,
-    bool? nativeSpellCheckServiceDefined,
-    bool? brieflyShowPassword,
     List<Locale>? locales,
     String? defaultRouteName,
     String? systemFontFamily,
@@ -1273,8 +1277,6 @@ class PlatformConfiguration {
       semanticsEnabled: semanticsEnabled ?? this.semanticsEnabled,
       platformBrightness: platformBrightness ?? this.platformBrightness,
       textScaleFactor: textScaleFactor ?? this.textScaleFactor,
-      nativeSpellCheckServiceDefined: nativeSpellCheckServiceDefined ?? this.nativeSpellCheckServiceDefined,
-      brieflyShowPassword: brieflyShowPassword ?? this.brieflyShowPassword,
       locales: locales ?? this.locales,
       defaultRouteName: defaultRouteName ?? this.defaultRouteName,
       systemFontFamily: systemFontFamily ?? this.systemFontFamily,
@@ -1300,22 +1302,6 @@ class PlatformConfiguration {
   /// The system-reported text scale.
   final double textScaleFactor;
 
-  /// Whether the spell check service is supported on the current platform.
-  ///
-  /// This option is used by [EditableTextState] to define its
-  /// [SpellCheckConfiguration] when a default spell check service
-  /// is requested.
-  final bool nativeSpellCheckServiceDefined;
-
-  /// Whether briefly displaying the characters as you type in obscured text
-  /// fields is enabled in system settings.
-  ///
-  /// See also:
-  ///
-  ///  * [EditableText.obscureText], which when set to true hides the text in
-  ///    the text field.
-  final bool brieflyShowPassword;
-
   /// The full system-reported supported locales of the device.
   final List<Locale> locales;
 
diff --git a/lib/web_ui/lib/platform_dispatcher.dart b/lib/web_ui/lib/platform_dispatcher.dart
index c8334741cc040..416361236456a 100644
--- a/lib/web_ui/lib/platform_dispatcher.dart
+++ b/lib/web_ui/lib/platform_dispatcher.dart
@@ -109,9 +109,9 @@ abstract class PlatformDispatcher {
 
   double get textScaleFactor => configuration.textScaleFactor;
 
-  bool get nativeSpellCheckServiceDefined => configuration.nativeSpellCheckServiceDefined;
+  bool get nativeSpellCheckServiceDefined => false;
 
-  bool get brieflyShowPassword => configuration.brieflyShowPassword;
+  bool get brieflyShowPassword => true;
 
   VoidCallback? get onTextScaleFactorChanged;
   set onTextScaleFactorChanged(VoidCallback? callback);
@@ -152,8 +152,6 @@ class PlatformConfiguration {
     this.semanticsEnabled = false,
     this.platformBrightness = Brightness.light,
     this.textScaleFactor = 1.0,
-    this.nativeSpellCheckServiceDefined = false,
-    this.brieflyShowPassword = true,
     this.locales = const <Locale>[],
     this.defaultRouteName = '/',
     this.systemFontFamily,
@@ -165,8 +163,6 @@ class PlatformConfiguration {
     bool? semanticsEnabled,
     Brightness? platformBrightness,
     double? textScaleFactor,
-    bool? nativeSpellCheckServiceDefined,
-    bool? brieflyShowPassword,
     List<Locale>? locales,
     String? defaultRouteName,
     String? systemFontFamily,
@@ -177,8 +173,6 @@ class PlatformConfiguration {
       semanticsEnabled: semanticsEnabled ?? this.semanticsEnabled,
       platformBrightness: platformBrightness ?? this.platformBrightness,
       textScaleFactor: textScaleFactor ?? this.textScaleFactor,
-      nativeSpellCheckServiceDefined: nativeSpellCheckServiceDefined ?? this.nativeSpellCheckServiceDefined,
-      brieflyShowPassword: brieflyShowPassword ?? this.brieflyShowPassword,
       locales: locales ?? this.locales,
       defaultRouteName: defaultRouteName ?? this.defaultRouteName,
       systemFontFamily: systemFontFamily ?? this.systemFontFamily,
@@ -190,8 +184,6 @@ class PlatformConfiguration {
   final bool semanticsEnabled;
   final Brightness platformBrightness;
   final double textScaleFactor;
-  final bool nativeSpellCheckServiceDefined;
-  final bool brieflyShowPassword;
   final List<Locale> locales;
   final String defaultRouteName;
   final String? systemFontFamily;