diff --git a/cmd/oras/internal/meta/type.go b/cmd/oras/internal/meta/type.go
index 20dad7097..19d6d7956 100644
--- a/cmd/oras/internal/meta/type.go
+++ b/cmd/oras/internal/meta/type.go
@@ -35,6 +35,7 @@ func ToDigestReference(name string, digest string) DigestReference {
 // Descriptor is a descriptor with digest reference.
 type Descriptor struct {
 	DigestReference
+
 	// MediaType is the media type of the object this schema refers to.
 	MediaType string
 
diff --git a/test/e2e/suite/command/attach.go b/test/e2e/suite/command/attach.go
index d045b866d..3fece16c2 100644
--- a/test/e2e/suite/command/attach.go
+++ b/test/e2e/suite/command/attach.go
@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"path/filepath"
 	"regexp"
+	"strings"
 
 	. "github.com/onsi/ginkgo/v2"
 	"github.com/onsi/gomega"
@@ -126,10 +127,13 @@ var _ = Describe("1.1 registry users:", func() {
 			subjectRef := RegistryRef(ZOTHost, testRepo, foobar.Tag)
 			CopyZOTRepo(ImageRepo, testRepo)
 			// test
-			ref := ORAS("attach", "--artifact-type", "test/attach", subjectRef, fmt.Sprintf("%s:%s", foobar.AttachFileName, foobar.AttachFileMedia), "--export-manifest", exportName, "--format", "{{.Ref}}").
+			delimitter := "|"
+			output := ORAS("attach", "--artifact-type", "test/attach", subjectRef, fmt.Sprintf("%s:%s", foobar.AttachFileName, foobar.AttachFileMedia), "--export-manifest", exportName, "--format", fmt.Sprintf("{{.Ref%s.ArtifactType}}", delimitter)).
 				WithWorkDir(tempDir).Exec().Out.Contents()
+			ref, artifactType, _ := strings.Cut(string(output), delimitter)
 			// validate
-			fetched := ORAS("manifest", "fetch", string(ref)).Exec().Out.Contents()
+			Expect(artifactType).To(Equal("test/attach"))
+			fetched := ORAS("manifest", "fetch", ref).Exec().Out.Contents()
 			MatchFile(filepath.Join(tempDir, exportName), string(fetched), DefaultTimeout)
 		})