diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_error.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_error.rs
index 8a39c95ef..bf0d8103e 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_error.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_error.rs
@@ -279,21 +279,32 @@ mod tests {
         for line in &lines {
             assert!(!line.contains('\n'), "{line}");
         }
-        // 落盘边界按真实口径核验：应用日志的整行脱敏既不能吃掉身份字段，也不能靠换行拆行。
-        let persisted = crate::sanitize_diagnostic_message(&lines.join(" "), None);
-        assert!(persisted.contains("eventId=error-1-1"), "{persisted}");
-        assert!(persisted.contains("code=turn-idle-timeout"), "{persisted}");
+        // 落盘边界按真实口径核验：应用日志逐行脱敏、逐行截断，两行不会先拼在一起。
+        let persisted = lines
+            .iter()
+            .map(|line| crate::sanitize_diagnostic_message(line, None))
+            .collect::<Vec<_>>();
+        for line in &persisted {
+            assert!(!line.contains("token=secret"), "{line}");
+            assert!(line.chars().count() <= 2_048, "{line}");
+        }
+        let identity = &persisted[0];
+        assert!(identity.contains("eventId=error-1-1"), "{identity}");
+        assert!(identity.contains("code=turn-idle-timeout"), "{identity}");
         assert!(
-            persisted.contains("detailRef=.agent/runtime/errors/error-1-1.json"),
-            "{persisted}"
+            identity.contains("detailRef=.agent/runtime/errors/error-1-1.json"),
+            "{identity}"
         );
-        assert!(persisted.contains("summary=本轮没有收到完成事件 附带换行"));
-        assert!(persisted.contains("detail=<absolute-path> <redacted-url> 第二行诊断"));
         assert!(
-            !persisted.contains("token=secret") && !persisted.contains("Bearer secret"),
-            "{persisted}"
+            identity.contains("summary=本轮没有收到完成事件 附带换行"),
+            "{identity}"
         );
-        assert!(persisted.chars().count() <= 2_048, "{persisted}");
+        let detail = &persisted[1];
+        assert!(
+            detail.contains("detail=<absolute-path> <redacted-url> 第二行诊断"),
+            "{detail}"
+        );
+        assert!(!detail.contains("Bearer secret"), "{detail}");
     }
 
     #[test]