The pinning line shows the built image's id, not one digit of it

internal/bootstrap/control.go

@@ -79,7 +79,7 @@ func InstallControlPlane(ctx context.Context, o Options, d Deps, control control
 	if err != nil {
 		return out, err
 	}
-	say(fmt.Sprintf("  pinned            %s → %s, in %d place(s)", shortRef(built.Image), image, places))
+	say(fmt.Sprintf("  pinned            %s → %s, in %d place(s)", shortImage(built.Image), image, places))
 
 	container, _, err := containerIn(pinned, controlPlaneResourceIn(pinned))
 	if err != nil {
@@ -398,3 +398,13 @@ func sortedKeys(m map[string]string) []string {
 	sort.Strings(keys)
 	return keys
 }
+
+// shortImage is an image id as a person reads one: the first twelve hex digits, without the
+// algorithm in front — `shortRef` would keep the prefix and show one digit of the digest.
+func shortImage(id string) string {
+	digest := strings.TrimPrefix(id, "sha256:")
+	if len(digest) > 12 {
+		return digest[:12]
+	}
+	return digest
+}