diff --git a/crates/matrix-sdk-common/src/deserialized_responses.rs b/crates/matrix-sdk-common/src/deserialized_responses.rs
index 0e40127944..890f1645fc 100644
--- a/crates/matrix-sdk-common/src/deserialized_responses.rs
+++ b/crates/matrix-sdk-common/src/deserialized_responses.rs
@@ -1443,4 +1443,47 @@ mod tests {
             }
         });
     }
+
+    #[test]
+    fn snapshot_test_sync_timeline_event() {
+        let room_event = SyncTimelineEvent {
+            kind: TimelineEventKind::Decrypted(DecryptedRoomEvent {
+                event: Raw::new(&example_event()).unwrap().cast(),
+                encryption_info: EncryptionInfo {
+                    sender: user_id!("@sender:example.com").to_owned(),
+                    sender_device: Some(device_id!("ABCDEFGHIJ").to_owned()),
+                    algorithm_info: AlgorithmInfo::MegolmV1AesSha2 {
+                        curve25519_key: "xxx".to_owned(),
+                        sender_claimed_keys: BTreeMap::from([
+                            (
+                                DeviceKeyAlgorithm::Ed25519,
+                                "I3YsPwqMZQXHkSQbjFNEs7b529uac2xBpI83eN3LUXo".to_owned(),
+                            ),
+                            (
+                                DeviceKeyAlgorithm::Curve25519,
+                                "qzdW3F5IMPFl0HQgz5w/L5Oi/npKUFn8Um84acIHfPY".to_owned(),
+                            ),
+                        ]),
+                    },
+                    verification_state: VerificationState::Verified,
+                },
+                unsigned_encryption_info: Some(BTreeMap::from([(
+                    UnsignedEventLocation::RelationsThreadLatestEvent,
+                    UnsignedDecryptionResult::UnableToDecrypt(UnableToDecryptInfo {
+                        session_id: Some("xyz".to_owned()),
+                        reason: UnableToDecryptReason::MissingMegolmSession {
+                            withheld_code: Some(WithheldCode::Unverified),
+                        },
+                    }),
+                )])),
+            }),
+            push_actions: Default::default(),
+        };
+
+        with_settings!({sort_maps =>true}, {
+            assert_json_snapshot! {
+                serde_json::to_value(&room_event).unwrap(),
+            }
+        });
+    }
 }
diff --git a/crates/matrix-sdk-common/src/snapshots/matrix_sdk_common__deserialized_responses__tests__snapshot_test_sync_timeline_event.snap b/crates/matrix-sdk-common/src/snapshots/matrix_sdk_common__deserialized_responses__tests__snapshot_test_sync_timeline_event.snap
new file mode 100644
index 0000000000..f40882141c
--- /dev/null
+++ b/crates/matrix-sdk-common/src/snapshots/matrix_sdk_common__deserialized_responses__tests__snapshot_test_sync_timeline_event.snap
@@ -0,0 +1,47 @@
+---
+source: crates/matrix-sdk-common/src/deserialized_responses.rs
+expression: "serde_json::to_value(&room_event).unwrap()"
+---
+{
+  "kind": {
+    "Decrypted": {
+      "encryption_info": {
+        "algorithm_info": {
+          "MegolmV1AesSha2": {
+            "curve25519_key": "xxx",
+            "sender_claimed_keys": {
+              "curve25519": "qzdW3F5IMPFl0HQgz5w/L5Oi/npKUFn8Um84acIHfPY",
+              "ed25519": "I3YsPwqMZQXHkSQbjFNEs7b529uac2xBpI83eN3LUXo"
+            }
+          }
+        },
+        "sender": "@sender:example.com",
+        "sender_device": "ABCDEFGHIJ",
+        "verification_state": "Verified"
+      },
+      "event": {
+        "content": {
+          "body": "secret",
+          "msgtype": "m.text"
+        },
+        "event_id": "$xxxxx:example.org",
+        "origin_server_ts": 2189,
+        "room_id": "!someroom:example.com",
+        "sender": "@carl:example.com",
+        "type": "m.room.message"
+      },
+      "unsigned_encryption_info": {
+        "RelationsThreadLatestEvent": {
+          "UnableToDecrypt": {
+            "reason": {
+              "MissingMegolmSession": {
+                "withheld_code": "m.unverified"
+              }
+            },
+            "session_id": "xyz"
+          }
+        }
+      }
+    }
+  }
+}