diff --git a/backend/src/test/java/org/raddatz/familienarchiv/service/PersonMentionPropagationListenerTest.java b/backend/src/test/java/org/raddatz/familienarchiv/service/PersonMentionPropagationListenerTest.java
index 38568cc1..3cd98ea2 100644
--- a/backend/src/test/java/org/raddatz/familienarchiv/service/PersonMentionPropagationListenerTest.java
+++ b/backend/src/test/java/org/raddatz/familienarchiv/service/PersonMentionPropagationListenerTest.java
@@ -143,6 +143,28 @@ class PersonMentionPropagationListenerTest {
                 .containsExactly("Augusta Raddatz");
     }
 
+    @Test
+    void noOps_whenPersonIdNoLongerExists_orphanedSidecarGuard() {
+        UUID orphanId = UUID.randomUUID();
+        when(personService.existsById(orphanId)).thenReturn(false);
+
+        TranscriptionBlock saved = saveBlock(
+                "Stale reference to @Ghost Name should not be rewritten.",
+                List.of(new PersonMention(orphanId, "Ghost Name")));
+        em.clear();
+
+        listener.onPersonDisplayNameChanged(
+                new PersonDisplayNameChangedEvent(orphanId, "Ghost Name", "Resurrected Name"));
+        blockRepository.flush();
+        em.clear();
+
+        TranscriptionBlock reloaded = blockRepository.findById(saved.getId()).orElseThrow();
+        assertThat(reloaded.getText()).isEqualTo("Stale reference to @Ghost Name should not be rewritten.");
+        assertThat(reloaded.getMentionedPersons())
+                .extracting(PersonMention::getDisplayName)
+                .containsExactly("Ghost Name");
+    }
+
     @Test
     void leavesUnrelatedBlockUntouched_whenNoSidecarReferencesPerson() {
         UUID personId = savedPersonId("Auguste", "Raddatz");