diff --git a/cmd/config/internal/commands/e2e/e2econtainerconfig/main.go b/cmd/config/internal/commands/e2e/e2econtainerconfig/main.go
index d3e6b0e6c7..91595bd937 100644
--- a/cmd/config/internal/commands/e2e/e2econtainerconfig/main.go
+++ b/cmd/config/internal/commands/e2e/e2econtainerconfig/main.go
@@ -8,6 +8,7 @@ import (
 	"os"
 	"strconv"
 
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"sigs.k8s.io/kustomize/kyaml/fn/framework"
 	"sigs.k8s.io/kustomize/kyaml/fn/framework/command"
 	"sigs.k8s.io/kustomize/kyaml/kio"
@@ -16,6 +17,9 @@ import (
 
 // Config defines the ResourceList.functionConfig schema.
 type Config struct {
+	metav1.TypeMeta   `json:",inline"`
+	metav1.ObjectMeta `json:"metadata,omitempty"`
+
 	// Data contains configuration data for the Example
 	// Nest values under Data so that the function can accept a ConfigMap as its
 	// functionConfig (`run` generates a ConfigMap for the functionConfig when run with --)
diff --git a/kyaml/fn/framework/processors.go b/kyaml/fn/framework/processors.go
index 1b390b2695..0904c3bd6d 100644
--- a/kyaml/fn/framework/processors.go
+++ b/kyaml/fn/framework/processors.go
@@ -156,7 +156,7 @@ func LoadFunctionConfig(src *yaml.RNode, api interface{}) error {
 
 	// using sigs.k8s.io/yaml here lets the custom types embed core types
 	// that only have json tags, notably types from k8s.io/apimachinery/pkg/apis/meta/v1
-	if err := k8syaml.Unmarshal([]byte(src.MustString()), api); err != nil {
+	if err := k8syaml.UnmarshalStrict([]byte(src.MustString()), api); err != nil {
 		if schemaValidationError != nil {
 			// if we got a validation error, report it instead as it is likely a nicer version of the same message
 			return schemaValidationError
diff --git a/kyaml/fn/framework/processors_test.go b/kyaml/fn/framework/processors_test.go
index 88eee73897..8b75c7970d 100644
--- a/kyaml/fn/framework/processors_test.go
+++ b/kyaml/fn/framework/processors_test.go
@@ -834,6 +834,26 @@ test: true
 			api:  &yamlTagTest{},
 			want: &yamlTagTest{Name: "tester", Test: true},
 		},
+		{
+			name: "fails on unknown fields on types with yaml tags",
+			src: yaml.MustParse(`
+name: tester
+test: true
+unknown: field
+`),
+			api:         &yamlTagTest{},
+			wantErrMsgs: []string{`error unmarshaling JSON: while decoding JSON: json: unknown field "unknown"`},
+		},
+		{
+			name: "fails on unknown fields on types with json tags",
+			src: yaml.MustParse(`
+name: tester
+test: true
+unknown: field
+`),
+			api:         &jsonTagTest{},
+			wantErrMsgs: []string{`error unmarshaling JSON: while decoding JSON: json: unknown field "unknown"`},
+		},
 	}
 
 	for _, tt := range tests {