diff --git a/B06_Section/B06_Section_UI_Page_Persist.ts b/B06_Section/B06_Section_UI_Page_Persist.ts
index b9476cf7..dd02a77f 100644
--- a/B06_Section/B06_Section_UI_Page_Persist.ts
+++ b/B06_Section/B06_Section_UI_Page_Persist.ts
@@ -16,6 +16,7 @@ import {
   type SectionContextResponse,
   type SectionDetailResponse,
 } from "./B06_Section_Api_Fetch";
+import { invalidateSectionDetail } from "./B06_Section_Section_Store";
 import { flushPendingStructures } from "../B05_Profile/B05_Profile_Api_Structures";
 import { flushUphillOverrides } from "../B05_Profile/B05_Profile_Api_Fetch";
 import { buildCrossPatches, type CrossPatchSources } from "./B06_Section_UI_Page_Patches";
@@ -270,6 +271,10 @@ export async function saveCurrentSections(ctx: SectionPersistContext): Promise<v
       edits.crossPatches.length ? edits.crossPatches : undefined,
       edits.massHaul,
     );
+    // 저장으로 구조물 초안이 정본이 됐다 — 화면이 들고 있던 상세는 초안 기준으로 벽을
+    // 얹은 사본이라, 그대로 두면 새로 저장된 구조물의 벽이 다음 조회까지 안 붙는다
+    // (2026-09-06 실측: 8+0.0 흙막이가 저장 뒤 화면 사본에만 빠져 있었음).
+    invalidateSectionDetail(ctx.projectId, routeId);
     showToast(L("B06_Profile_Save_Success"), "success");
   } catch (error) {
     const detail = error instanceof Error ? ` ${error.message}` : "";