diff --git a/pkg/analyzer/lib/src/dart/element/element.dart b/pkg/analyzer/lib/src/dart/element/element.dart
index 97ce9dfc91e2..08a726bfa302 100644
--- a/pkg/analyzer/lib/src/dart/element/element.dart
+++ b/pkg/analyzer/lib/src/dart/element/element.dart
@@ -5359,6 +5359,9 @@ abstract class InstanceElementImpl2 extends ElementImpl2
   @override
   List<PropertyAccessorElement> accessors = [];
 
+  @override
+  List<MethodElement> methods = [];
+
   @override
   List<MethodElementImpl2> methods2 = [];
 
@@ -5428,42 +5431,6 @@ abstract class InstanceElementImpl2 extends ElementImpl2
   @override
   Metadata get metadata2 => firstFragment.metadata2;
 
-  @override
-  List<MethodElement> get methods {
-    return methods2.map((element) {
-      var firstTypeParameters = firstFragment.typeParameters;
-
-      var lastFragment = element.lastFragment;
-      var lastInstance = lastFragment.enclosingFragment;
-      if (identical(lastInstance, firstFragment)) {
-        return lastFragment;
-      }
-
-      var lastTypeParameters = lastInstance.typeParameters2;
-      if (firstTypeParameters.isEmpty && lastTypeParameters.isEmpty) {
-        return lastFragment;
-      }
-
-      MapSubstitution toFirstFragment;
-      if (lastTypeParameters.length == firstTypeParameters.length) {
-        toFirstFragment = Substitution.fromPairs(
-          lastTypeParameters,
-          firstTypeParameters.instantiateNone(),
-        );
-      } else {
-        toFirstFragment = Substitution.fromPairs(
-          lastTypeParameters,
-          List.filled(
-            lastTypeParameters.length,
-            InvalidTypeImpl.instance,
-          ),
-        );
-      }
-
-      return MethodMember(lastFragment, toFirstFragment, Substitution.empty);
-    }).toList();
-  }
-
   @override
   String? get name3 => firstFragment.name;
 
@@ -7699,8 +7666,8 @@ class MethodElementImpl extends ExecutableElementImpl
   }
 
   @override
-  InstanceElementImpl get enclosingFragment =>
-      enclosingElement3 as InstanceElementImpl;
+  InstanceFragment? get enclosingFragment =>
+      enclosingElement3 as InstanceFragment;
 
   /// Set whether this class is abstract.
   set isAbstract(bool isAbstract) {
@@ -7733,7 +7700,7 @@ class MethodElementImpl extends ExecutableElementImpl
   }
 
   @override
-  MethodElementImpl? get nextFragment => augmentation;
+  MethodFragment? get nextFragment => augmentation;
 
   @override
   Element get nonSynthetic {
@@ -7744,7 +7711,7 @@ class MethodElementImpl extends ExecutableElementImpl
   }
 
   @override
-  MethodElementImpl? get previousFragment => augmentationTarget;
+  MethodFragment? get previousFragment => augmentationTarget;
 
   @override
   T? accept<T>(ElementVisitor<T> visitor) => visitor.visitMethodElement(this);
@@ -7785,17 +7752,6 @@ class MethodElementImpl2 extends ExecutableElementImpl2
   @override
   ElementKind get kind => ElementKind.METHOD;
 
-  MethodElementImpl get lastFragment {
-    var lastFragment = firstFragment;
-    while (true) {
-      if (lastFragment.nextFragment case var nextFragment?) {
-        lastFragment = nextFragment;
-      } else {
-        return lastFragment;
-      }
-    }
-  }
-
   @override
   T? accept2<T>(ElementVisitor2<T> visitor) {
     return visitor.visitMethodElement(this);
@@ -10650,8 +10606,8 @@ mixin TypeParameterizedElementMixin on ElementImpl
   }
 
   @override
-  List<TypeParameterElementImpl> get typeParameters2 =>
-      typeParameters.cast<TypeParameterElementImpl>();
+  List<TypeParameterFragment> get typeParameters2 =>
+      typeParameters.cast<TypeParameterFragment>();
 
   List<TypeParameterElement> get typeParameters_unresolved {
     return _typeParameters;
diff --git a/pkg/analyzer/lib/src/summary2/augmentation.dart b/pkg/analyzer/lib/src/summary2/augmentation.dart
index 22fedae9d604..75ba87652880 100644
--- a/pkg/analyzer/lib/src/summary2/augmentation.dart
+++ b/pkg/analyzer/lib/src/summary2/augmentation.dart
@@ -269,6 +269,7 @@ abstract class InstanceElementBuilder<E extends InstanceElementImpl2,
 
     augmented.fields.addAll(firstFragment.fields);
     augmented.accessors.addAll(firstFragment.accessors);
+    augmented.methods.addAll(firstFragment.methods);
 
     if (augmented is InterfaceElementImpl2) {
       if (firstFragment is InterfaceElementImpl) {
@@ -358,6 +359,16 @@ abstract class InstanceElementBuilder<E extends InstanceElementImpl2,
             element, toFirstFragment, Substitution.empty);
       }),
     ];
+
+    element.methods = [
+      ...element.methods.notAugmented,
+      ...augmentation.methods.notAugmented.map((element) {
+        if (toFirstFragment.map.isEmpty) {
+          return element;
+        }
+        return MethodMember(element, toFirstFragment, Substitution.empty);
+      }),
+    ];
   }
 }
 
diff --git a/pkg/analyzer/lib/src/summary2/bundle_reader.dart b/pkg/analyzer/lib/src/summary2/bundle_reader.dart
index 37e6a7d1be18..7730ed421257 100644
--- a/pkg/analyzer/lib/src/summary2/bundle_reader.dart
+++ b/pkg/analyzer/lib/src/summary2/bundle_reader.dart
@@ -147,6 +147,7 @@ class ClassElementLinkedData extends ElementLinkedData<ClassElementImpl> {
       augmented.fields = reader.readElementList();
       augmented.constructors = reader.readElementList();
       augmented.accessors = reader.readElementList();
+      augmented.methods = reader.readElementList();
     }
 
     applyConstantOffsets?.perform();
@@ -371,6 +372,7 @@ class EnumElementLinkedData extends ElementLinkedData<EnumElementImpl> {
       augmented.fields = reader.readElementList();
       augmented.constructors = reader.readElementList();
       augmented.accessors = reader.readElementList();
+      augmented.methods = reader.readElementList();
     }
     applyConstantOffsets?.perform();
   }
@@ -403,6 +405,7 @@ class ExtensionElementLinkedData
       var augmented = element.augmentedInternal;
       augmented.fields = reader.readElementList();
       augmented.accessors = reader.readElementList();
+      augmented.methods = reader.readElementList();
       augmented.extendedType = extendedType;
     }
 
@@ -439,6 +442,7 @@ class ExtensionTypeElementLinkedData
       augmented.fields = reader.readElementList();
       augmented.accessors = reader.readElementList();
       augmented.constructors = reader.readElementList();
+      augmented.methods = reader.readElementList();
       augmented
         ..primaryConstructor = element.constructors.first
         ..representation = element.fields.first
@@ -1943,6 +1947,7 @@ class MixinElementLinkedData extends ElementLinkedData<MixinElementImpl> {
       augmented.interfaces = reader._readInterfaceTypeList();
       augmented.fields = reader.readElementList();
       augmented.accessors = reader.readElementList();
+      augmented.methods = reader.readElementList();
     }
 
     applyConstantOffsets?.perform();
diff --git a/pkg/analyzer/lib/src/summary2/bundle_writer.dart b/pkg/analyzer/lib/src/summary2/bundle_writer.dart
index b4c1f391314e..3e002b9a62a8 100644
--- a/pkg/analyzer/lib/src/summary2/bundle_writer.dart
+++ b/pkg/analyzer/lib/src/summary2/bundle_writer.dart
@@ -165,6 +165,7 @@ class BundleWriter {
         _resolutionSink._writeElementList(augmented.fields);
         _resolutionSink._writeElementList(augmented.constructors);
         _resolutionSink._writeElementList(augmented.accessors);
+        _resolutionSink._writeElementList(augmented.methods);
       }
 
       if (!element.isMixinApplication) {
@@ -257,6 +258,7 @@ class BundleWriter {
         _resolutionSink._writeElementList(augmented.fields);
         _resolutionSink._writeElementList(augmented.constructors);
         _resolutionSink._writeElementList(augmented.accessors);
+        _resolutionSink._writeElementList(augmented.methods);
       }
 
       _writeList(
@@ -318,6 +320,7 @@ class BundleWriter {
         _resolutionSink.writeType(augmented.extendedType);
         _resolutionSink._writeElementList(augmented.fields);
         _resolutionSink._writeElementList(augmented.accessors);
+        _resolutionSink._writeElementList(augmented.methods);
       }
 
       _writeList(
@@ -350,6 +353,7 @@ class BundleWriter {
         _resolutionSink._writeElementList(augmented.fields);
         _resolutionSink._writeElementList(augmented.accessors);
         _resolutionSink._writeElementList(augmented.constructors);
+        _resolutionSink._writeElementList(augmented.methods);
         _resolutionSink.writeType(augmented.typeErasure);
       }
 
@@ -528,6 +532,7 @@ class BundleWriter {
         _resolutionSink._writeTypeList(augmented.interfaces);
         _resolutionSink._writeElementList(augmented.fields);
         _resolutionSink._writeElementList(augmented.accessors);
+        _resolutionSink._writeElementList(augmented.methods);
       }
 
       _writeList(
diff --git a/pkg/analyzer/lib/src/test_utilities/mock_sdk_elements.dart b/pkg/analyzer/lib/src/test_utilities/mock_sdk_elements.dart
index 50c1b764736b..33c98788c978 100644
--- a/pkg/analyzer/lib/src/test_utilities/mock_sdk_elements.dart
+++ b/pkg/analyzer/lib/src/test_utilities/mock_sdk_elements.dart
@@ -925,14 +925,7 @@ class _MockSdkElementsBuilder {
     element.fields = fragment.fields;
     element.constructors = fragment.constructors;
     element.accessors = fragment.accessors;
-
-    element.methods2 = fragment.methods.map((firstFragment) {
-      return MethodElementImpl2(
-        Reference.root(),
-        firstFragment.name2,
-        firstFragment,
-      );
-    }).toList();
+    element.methods = fragment.methods;
   }
 
   LibraryElementImpl _buildCore() {
diff --git a/pkg/analyzer/test/generated/elements_types_mixin.dart b/pkg/analyzer/test/generated/elements_types_mixin.dart
index 41afb53a1d23..6457d252e675 100644
--- a/pkg/analyzer/test/generated/elements_types_mixin.dart
+++ b/pkg/analyzer/test/generated/elements_types_mixin.dart
@@ -147,6 +147,7 @@ mixin ElementsTypesMixin {
     var element = ClassElementImpl2(Reference.root(), fragment);
     element.mixins = fragment.mixins;
     element.interfaces = fragment.interfaces;
+    element.methods = fragment.methods;
 
     return fragment;
   }
@@ -433,6 +434,7 @@ mixin ElementsTypesMixin {
     var element = MixinElementImpl2(Reference.root(), fragment);
     element.superclassConstraints = fragment.superclassConstraints;
     element.interfaces = fragment.interfaces;
+    element.methods = fragment.methods;
 
     return fragment;
   }