diff --git a/A00_Common/design/design_pipeline_cross.ts b/A00_Common/design/design_pipeline_cross.ts
index 4382d9be0..cd22d4114 100644
--- a/A00_Common/design/design_pipeline_cross.ts
+++ b/A00_Common/design/design_pipeline_cross.ts
@@ -22,13 +22,20 @@ import {
   effectiveStandardCross,
   readRockBoundaryDefault,
 } from "../../B06_Section/B06_Section_UI_Standard_Panel";
-import type {
-  CrossInput,
-  SeatedFields,
-  SectionSpecs,
+import {
+  crossAtSeat,
+  type CrossInput,
+  type SeatedFields,
+  type SectionSpecs,
 } from "../../B05_Profile/logic/B05_Profile_Pipeline_Detail";
 import { SEAT_HINT } from "../../B06_Section/logic/B06_Section_Route_Carry";
-import type { PipelineStation } from "./logic/design_pipeline_types";
+import {
+  SOURCE_INPUT,
+  type ChangeSource,
+  type PipelineInputs,
+  type PipelineStation,
+} from "./logic/design_pipeline_types";
+import type { DesignPipeline } from "./logic/design_pipeline";
 import type { StationSeat } from "../../common_util/common_util_station_key";
 
 export interface PipelineCrossSource {
@@ -252,3 +259,20 @@ export function pipelineCrossSource(
     specs,
   };
 }
+
+/** 맞춤이 다시 먹일 입력 — 지금 입력이 묶음 입력 · 넘긴 입력(follow 전) 둘 다와 다른 것. cross 는 지금 측점 자리로
+ *  자리 칸을 가른 뒤 견줌(`crossAtSeat` — 노선 초안 넘김이 새 자리 자리 칸만 걷은 것 = 같은 값 · 508-1c). */
+export function staleInputs(
+  now: PipelineInputs,
+  given: Partial<PipelineInputs>,
+  pipe: DesignPipeline,
+): Array<[ChangeSource, unknown]> {
+  const stations = pipe.output("ground")?.stations ?? [];
+  const seen = (key: keyof PipelineInputs, value: unknown): string =>
+    JSON.stringify(key === "cross" ? crossAtSeat(value as CrossInput | null, stations) : value);
+  return (Object.entries(SOURCE_INPUT) as Array<[ChangeSource, keyof PipelineInputs]>)
+    .filter(([, key]) =>
+      [pipe.input(key), given[key]].every((was) => seen(key, was) !== seen(key, now[key])),
+    )
+    .map(([source, key]) => [source, now[key]]);
+}
diff --git a/A00_Common/design/design_pipeline_page.ts b/A00_Common/design/design_pipeline_page.ts
index 5aacf0107..8be170cbc 100644
--- a/A00_Common/design/design_pipeline_page.ts
+++ b/A00_Common/design/design_pipeline_page.ts
@@ -70,6 +70,7 @@ import { fetchStructureTypes } from "../../B05_Profile/B05_Profile_Api_Structure
 import { forgetPageData, pagePipes, pageStructures, trackPageBusy } from "./design_page_data";
 import type { PagePipelineOptions, ProfileLink } from "./design_pipeline_page_types";
 import { createPageSaved } from "./design_pipeline_page_saved";
+import { staleInputs } from "./design_pipeline_cross";
 import {
   draftDetailOf,
   heldSectionDetail,
@@ -563,10 +564,7 @@ function createPagePipeline(
         await pipe.settled();
         if (disposed || pageSaved.canonRouteId() !== savedSource().routeId) return round; // 정본 바뀜 = restart 몫
         if (facilities.saving()) return (facilities.afterSave(), round); // 저장 도중 = 옛 저장분 · 끝나면 다시
-        const now = inputsNow();
-        const stale = (Object.entries(SOURCE_INPUT) as Array<[ChangeSource, keyof PipelineInputs]>)
-          .filter(([, key]) => !same(now[key], pipe.input(key)) && !same(now[key], given[key]))
-          .map(([source, key]): [ChangeSource, unknown] => [source, now[key]]);
+        const stale = staleInputs(inputsNow(), given, pipe); // cross = 지금 측점 자리로 견줌(508-1c)
         if (!stale.length) return round;
         if (round >= RECONCILE_ROUNDS) {
           options.onUnstable?.();
diff --git a/resources/tester/helper_verify_project.py b/resources/tester/helper_verify_project.py
index e2998d0ee..97c768b7d 100644
--- a/resources/tester/helper_verify_project.py
+++ b/resources/tester/helper_verify_project.py
@@ -9,8 +9,6 @@ from __future__ import annotations
 
 import os
 import re
-
-import pytest
 from pathlib import Path
 
 ROOT = Path(__file__).resolve().parents[2]
@@ -55,10 +53,3 @@ def find_project(*rels: str) -> Path:
         and (project / "B06_Section" / "cross_sections").is_dir()
     ]
     return min(found, key=lambda project: _touched(project, rels), default=NONE)
-
-
-#: 제품 흠으로 보고한 시험만(508-1a) — 고치면 그 시험에서 걷음
-DRIFT = pytest.mark.xfail(
-    strict=False,
-    reason="508-1a 제품 흠: 노선 초안 자리 칸 넘김이 cross 입력을 바꿔 cross 군더더기 차례(a02367e61)",
-)
diff --git a/resources/tester/test_349_0o_redo_same.py b/resources/tester/test_349_0o_redo_same.py
index 6b3afb5c3..d3c40c79a 100644
--- a/resources/tester/test_349_0o_redo_same.py
+++ b/resources/tester/test_349_0o_redo_same.py
@@ -25,7 +25,7 @@ ROOT = HERE.parents[1]
 if str(ROOT) not in sys.path:
     sys.path.insert(0, str(ROOT))
 
-from helper_verify_project import DRIFT, ROUTE_SET, SKIP_REASON, find_project  # noqa: E402
+from helper_verify_project import ROUTE_SET, SKIP_REASON, find_project  # noqa: E402
 
 from B05_Profile.B05_Profile_Structures_Schema import structure_type_map  # noqa: E402
 from common_util.common_util_surface_sampler import dtm_grid_bytes  # noqa: E402
@@ -149,7 +149,6 @@ def test_열기(r):
     assert o["final"] is not None
 
 
-@DRIFT
 def test_끌기_새_노선(r):
     d = r["first"]
     assert [x["sources"] for x in d["runs"]] == [["route"]], d["runs"]
@@ -188,7 +187,6 @@ def test_다시_하기_첫_끌기_값(r):
     assert d["stations"] == f["stations"]
 
 
-@DRIFT
 def test_횡단_보기_다녀와도_열기_값(r):
     o = r["open"]
     for step in (r["cross"], r["back"]):