diff --git a/modules/distribution/internal/holder/holder_test.go b/modules/distribution/internal/holder/holder_test.go
index 332a3757e..aaf559ff6 100644
--- a/modules/distribution/internal/holder/holder_test.go
+++ b/modules/distribution/internal/holder/holder_test.go
@@ -243,8 +243,13 @@ func TestTheHolderOfTheTwoImageSeats(t *testing.T) {
 		if a, _ := b.h.Publish(ArtifactSeat, builder, req("t1")); !reflect.DeepEqual(a.Missing, []string{part.Digest}) {
 			t.Errorf("resumed publish = %+v", a)
 		}
-		if _, err := b.h.PublishPart(ArtifactSeat, builder, PartRequest{Transfer: "t1", Digest: part.Digest, Sequence: 0, Data: blob[:1000]}); err == nil {
-			t.Error("a chunk sent twice was taken: the transfer goes on from the chunks held")
+		// A chunk 0 again starts the part afresh (it travels whole again, design 51 Publishing); a chunk that is neither the
+		// cursor nor 0 is refused, naming the cursor.
+		if _, err := b.h.PublishPart(ArtifactSeat, builder, PartRequest{Transfer: "t1", Digest: part.Digest, Sequence: 0, Data: blob[:1000]}); err != nil {
+			t.Errorf("a chunk 0 sent again was refused: %v", err)
+		}
+		if _, err := b.h.PublishPart(ArtifactSeat, builder, PartRequest{Transfer: "t1", Digest: part.Digest, Sequence: 2, Data: blob[:1000]}); err == nil {
+			t.Error("a chunk out of sequence was taken: the transfer goes on from the chunks held")
 		}
 		a, err = b.h.PublishPart(ArtifactSeat, builder, PartRequest{Transfer: "t1", Digest: part.Digest, Sequence: 1, Last: true, Data: blob[1000:]})
 		if err != nil || !a.Ended || len(b.said) != 1 || b.said[0].event != EventPublished || b.said[0].body.Reference == "" {