diff --git a/server-rs/crates/module-runtime/src/membership/catalog.rs b/server-rs/crates/module-runtime/src/membership/catalog.rs
index e7d2860e3..681cf9aa9 100644
--- a/server-rs/crates/module-runtime/src/membership/catalog.rs
+++ b/server-rs/crates/module-runtime/src/membership/catalog.rs
@@ -173,10 +173,11 @@ pub fn resolve_runtime_profile_membership_plan_snapshot(
 }
 
 /// 升级比较基准：目录里的 `rank`（`Normal = 0`，越大越高）。
-pub fn runtime_profile_membership_plan_rank(plan: RuntimeProfileMembershipPlan) -> u8 {
-    resolve_runtime_profile_membership_plan_row(plan)
-        .map(|row| row.rank)
-        .unwrap_or(0)
+///
+/// 返回 `Option` 是为了把「目录缺行」显式化：不再用 `unwrap_or(0)` 把缺失伪装成 `Normal`，
+/// 否则缺失会被 `check_..._allowed` 误判成「目标不高于当前」→ 误报 `NotUpgrade`。
+pub fn runtime_profile_membership_plan_rank(plan: RuntimeProfileMembershipPlan) -> Option<u8> {
+    resolve_runtime_profile_membership_plan_row(plan).map(|row| row.rank)
 }
 
 /// 只有在售档位可以下单：`Normal` 与下架档位都不允许购买。
@@ -371,15 +372,15 @@ mod tests {
     fn plan_rank_follows_catalog_order() {
         assert_eq!(
             runtime_profile_membership_plan_rank(RuntimeProfileMembershipPlan::Normal),
-            0
+            Some(0)
         );
         assert_eq!(
             runtime_profile_membership_plan_rank(RuntimeProfileMembershipPlan::Plus),
-            2
+            Some(2)
         );
         assert_eq!(
             runtime_profile_membership_plan_rank(RuntimeProfileMembershipPlan::Max),
-            4
+            Some(4)
         );
     }