diff --git a/conformance/utils/suite/suite.go b/conformance/utils/suite/suite.go
index 31db06c596..0fce3d201b 100644
--- a/conformance/utils/suite/suite.go
+++ b/conformance/utils/suite/suite.go
@@ -227,6 +227,22 @@ func NewConformanceTestSuite(options ConformanceOptions) (*ConformanceTestSuite,
 		return nil, fmt.Errorf("no supported features were determined for test suite")
 	}
 
+	extendedSupportedFeatures := make(map[ConformanceProfileName]FeaturesSet, 0)
+	extendedUnsupportedFeatures := make(map[ConformanceProfileName]FeaturesSet, 0)
+
+	for _, conformanceProfileName := range options.ConformanceProfiles.UnsortedList() {
+		conformanceProfile, err := getConformanceProfileForName(conformanceProfileName)
+		if err != nil {
+			return nil, fmt.Errorf("failed to retrieve conformance profile: %w", err)
+		}
+		// the use of a conformance profile implicitly enables any features of
+		// that profile which are supported at a Core level of support.
+		supportedFeatures = supportedFeatures.Union(conformanceProfile.CoreFeatures)
+
+		extendedSupportedFeatures[conformanceProfileName] = conformanceProfile.ExtendedFeatures.Intersection(supportedFeatures)
+		extendedUnsupportedFeatures[conformanceProfileName] = conformanceProfile.ExtendedFeatures.Difference(supportedFeatures)
+	}
+
 	config.SetupTimeoutConfig(&options.TimeoutConfig)
 
 	roundTripper := options.RoundTripper
@@ -284,8 +300,8 @@ func NewConformanceTestSuite(options ConformanceOptions) (*ConformanceTestSuite,
 		UsableNetworkAddresses:      options.UsableNetworkAddresses,
 		UnusableNetworkAddresses:    options.UnusableNetworkAddresses,
 		results:                     make(map[string]testResult),
-		extendedUnsupportedFeatures: make(map[ConformanceProfileName]sets.Set[features.FeatureName]),
-		extendedSupportedFeatures:   make(map[ConformanceProfileName]sets.Set[features.FeatureName]),
+		extendedUnsupportedFeatures: extendedUnsupportedFeatures,
+		extendedSupportedFeatures:   extendedSupportedFeatures,
 		conformanceProfiles:         options.ConformanceProfiles,
 		implementation:              options.Implementation,
 		mode:                        mode,
@@ -295,37 +311,6 @@ func NewConformanceTestSuite(options ConformanceOptions) (*ConformanceTestSuite,
 		Hook:                        options.Hook,
 	}
 
-	for _, conformanceProfileName := range options.ConformanceProfiles.UnsortedList() {
-		conformanceProfile, err := getConformanceProfileForName(conformanceProfileName)
-		if err != nil {
-			return nil, fmt.Errorf("failed to retrieve conformance profile: %w", err)
-		}
-		// the use of a conformance profile implicitly enables any features of
-		// that profile which are supported at a Core level of support.
-		for _, f := range conformanceProfile.CoreFeatures.UnsortedList() {
-			if !options.SupportedFeatures.Has(f) {
-				suite.SupportedFeatures.Insert(f)
-			}
-		}
-		for _, f := range conformanceProfile.ExtendedFeatures.UnsortedList() {
-			if options.SupportedFeatures.Has(f) {
-				if suite.extendedSupportedFeatures[conformanceProfileName] == nil {
-					suite.extendedSupportedFeatures[conformanceProfileName] = FeaturesSet{}
-				}
-				suite.extendedSupportedFeatures[conformanceProfileName].Insert(f)
-			} else {
-				if suite.extendedUnsupportedFeatures[conformanceProfileName] == nil {
-					suite.extendedUnsupportedFeatures[conformanceProfileName] = FeaturesSet{}
-				}
-				suite.extendedUnsupportedFeatures[conformanceProfileName].Insert(f)
-			}
-			// Add Exempt Features into unsupported features list
-			if options.ExemptFeatures.Has(f) {
-				suite.extendedUnsupportedFeatures[conformanceProfileName].Insert(f)
-			}
-		}
-	}
-
 	// apply defaults
 	if suite.BaseManifests == "" {
 		suite.BaseManifests = "base/manifests.yaml"
diff --git a/conformance/utils/suite/suite_test.go b/conformance/utils/suite/suite_test.go
index 778afa7180..179e038cdb 100644
--- a/conformance/utils/suite/suite_test.go
+++ b/conformance/utils/suite/suite_test.go
@@ -418,20 +418,21 @@ var statusFeatureNames = []string{
 	"HTTPRouteHostRewrite",
 	"HTTPRouteMethodMatching",
 	"HTTPRoutePathRewrite",
-	"TTPRouteQueryParamMatching",
+	"HTTPRouteQueryParamMatching",
 	"HTTPRouteResponseHeaderModification",
 	"ReferenceGrant",
 }
 
 func TestInferSupportedFeatures(t *testing.T) {
 	testCases := []struct {
-		name               string
-		allowAllFeatures   bool
-		supportedFeatures  FeaturesSet
-		exemptFeatures     FeaturesSet
-		ConformanceProfile sets.Set[ConformanceProfileName]
-		expectedFeatures   FeaturesSet
-		expectedSource     supportedFeaturesSource
+		name                     string
+		allowAllFeatures         bool
+		supportedFeatures        FeaturesSet
+		exemptFeatures           FeaturesSet
+		ConformanceProfile       sets.Set[ConformanceProfileName]
+		expectedFeatures         FeaturesSet
+		expectedExtendedFeatures map[ConformanceProfileName]sets.Set[features.FeatureName]
+		expectedSource           supportedFeaturesSource
 	}{
 		{
 			name:             "properly infer supported features",
@@ -458,10 +459,32 @@ func TestInferSupportedFeatures(t *testing.T) {
 			expectedSource:   supportedFeaturesSourceManual,
 		},
 		{
-			name:               "supports conformance profile - core",
+			name:               "supports conformance profile core with specified extended features",
+			ConformanceProfile: sets.New(GatewayHTTPConformanceProfileName),
+			supportedFeatures:  sets.New[features.FeatureName]("GatewayPort8080"),
+			expectedFeatures:   sets.New[features.FeatureName]("Gateway", "HTTPRoute", "GatewayPort8080", "ReferenceGrant"),
+			expectedSource:     supportedFeaturesSourceManual,
+			expectedExtendedFeatures: map[ConformanceProfileName]sets.Set[features.FeatureName]{
+				GatewayHTTPConformanceProfileName: namesToFeatureSet([]string{
+					"GatewayPort8080",
+				}),
+			},
+		},
+		{
+			name:               "supports conformance profile core with inferred extended features",
 			ConformanceProfile: sets.New(GatewayHTTPConformanceProfileName),
 			expectedFeatures:   namesToFeatureSet(statusFeatureNames),
 			expectedSource:     supportedFeaturesSourceInferred,
+			expectedExtendedFeatures: map[ConformanceProfileName]sets.Set[features.FeatureName]{
+				GatewayHTTPConformanceProfileName: namesToFeatureSet([]string{
+					"GatewayPort8080",
+					"HTTPRouteHostRewrite",
+					"HTTPRouteMethodMatching",
+					"HTTPRoutePathRewrite",
+					"HTTPRouteQueryParamMatching",
+					"HTTPRouteResponseHeaderModification",
+				}),
+			},
 		},
 	}
 
@@ -520,6 +543,11 @@ func TestInferSupportedFeatures(t *testing.T) {
 			if equal := cSuite.SupportedFeatures.Equal(tc.expectedFeatures); !equal {
 				t.Errorf("SupportedFeatures mismatch: got %v, want %v", cSuite.SupportedFeatures.UnsortedList(), tc.expectedFeatures.UnsortedList())
 			}
+
+			if tc.expectedExtendedFeatures == nil {
+				tc.expectedExtendedFeatures = make(map[ConformanceProfileName]sets.Set[features.FeatureName])
+			}
+			assert.Equal(t, tc.expectedExtendedFeatures, cSuite.extendedSupportedFeatures, "expectedExtendedFeatures mismatch")
 		})
 	}
 }