diff --git a/resources/tester/helper_349_0q_undo_echo.cjs b/resources/tester/helper_349_0q_undo_echo.cjs
index af7ac1493..aa503ef30 100644
--- a/resources/tester/helper_349_0q_undo_echo.cjs
+++ b/resources/tester/helper_349_0q_undo_echo.cjs
@@ -134,7 +134,10 @@ STUBS["B04_PreProcess_Api_Fetch"] = {
     pipe_points: job.pipes.map((pipe) => ({ ...pipe, lonlat: [0, 0] })),
   }),
 };
-STUBS["B06_Section_UI_Standard_Panel"] = { effectiveStandardCross: () => job.standard };
+STUBS["B06_Section_UI_Standard_Panel"] = {
+  effectiveStandardCross: () => job.standard,
+  readRockBoundaryDefault: () => -0.5,
+};
 // 구조물 초안 얹기(측점 계획 · 형상) — 이 시험 밖 · 아무 일 없음
 STUBS["B06_Section_Section_Drafts"] = {
   withDraftStations: async () => undefined,