diff --git a/scripts/nas_sync/run_corpus_standalone.sh b/scripts/nas_sync/run_corpus_standalone.sh
index 8101b33..229bb82 100644
--- a/scripts/nas_sync/run_corpus_standalone.sh
+++ b/scripts/nas_sync/run_corpus_standalone.sh
@@ -62,7 +62,14 @@ GID_ADMINS=101   # administrators(Synology ACL 授权组,金丝雀实测必带)
     echo "=== daily 非零($rc_daily), 跳过 backfill lane(次日自愈) ==="
   fi
 } >> "$LOG" 2>&1
-if [ "${rc_daily:-1}" -ne 0 ]; then
+# rc 聚合: 真失败(1/2)优先于让路(3);全让路=3;全零=0
+if [ "${rc_back:-0}" -ne 0 ] && [ "${rc_back:-0}" -ne 3 ]; then
+  exit "$rc_back"
+fi
+if [ "${rc_daily:-1}" -ne 0 ] && [ "${rc_daily:-1}" -ne 3 ]; then
   exit "$rc_daily"
 fi
-exit "${rc_back:-0}"
+if [ "${rc_daily:-1}" -ne 0 ] || [ "${rc_back:-0}" -ne 0 ]; then
+  exit 3
+fi
+exit 0