diff --git a/client/src/components/PDF/tripMapImage.ts b/client/src/components/PDF/tripMapImage.ts
index fd0960425..8c0100408 100644
--- a/client/src/components/PDF/tripMapImage.ts
+++ b/client/src/components/PDF/tripMapImage.ts
@@ -2,6 +2,7 @@ import { buildRouteOverlay, wrapSvg } from './tripMapSvg'
 import { hasWebGL } from '../../utils/webgl'
 import { normalizeStyleForProvider } from '../Map/glProviders'
 import type { TripOverviewDay } from '../Map/tripRouteGeometry'
+import { importChunk } from '../../utils/chunkReload'
 
 /**
  * The trip's route over a real basemap, for the PDF (#1736).
@@ -46,7 +47,7 @@ export async function renderTripMapImage(
   let container: HTMLDivElement | null = null
   let map: { remove: () => void } | null = null
   try {
-    const gl = (await import('../Map/engines/maplibre')).default
+    const gl = (await importChunk(() => import('../Map/engines/maplibre'))).default
 
     container = document.createElement('div')
     // Off-screen rather than hidden: MapLibre needs a laid-out box with real
diff --git a/client/src/components/Planner/TripExportModal.tsx b/client/src/components/Planner/TripExportModal.tsx
index 3d9501538..b532c174e 100644
--- a/client/src/components/Planner/TripExportModal.tsx
+++ b/client/src/components/Planner/TripExportModal.tsx
@@ -10,6 +10,7 @@ import { useSettingsStore } from '../../store/settingsStore'
 import { useRoadtripSettings } from '../../hooks/useRoadtripSettings'
 import { useAuthStore } from '../../store/authStore'
 import { hasPersonalPlan } from '../PDF/pdfScope'
+import { importChunk } from '../../utils/chunkReload'
 
 /**
  * What a GPX download can carry. Worded by what someone wants on their device
@@ -98,7 +99,7 @@ export function TripExportModal({
       // sidebar, so every trip used to pay for it whether or not anyone
       // exported. A missing chunk lands in the catch and shows the same error
       // the export already had.
-      const { downloadTripPDF } = await import('../PDF/TripPDF')
+      const { downloadTripPDF } = await importChunk(() => import('../PDF/TripPDF'))
       await downloadTripPDF({ trip, days, places, assignments, categories, dayNotes: flatNotes, reservations, t, locale, timeFormat, distanceUnit, showServiceStops, onlyUserId: mine ? myId : undefined })
       onClose()
     } catch (e) {
diff --git a/client/src/components/Vacay/holidayRegions.ts b/client/src/components/Vacay/holidayRegions.ts
index 8be378baf..055803627 100644
--- a/client/src/components/Vacay/holidayRegions.ts
+++ b/client/src/components/Vacay/holidayRegions.ts
@@ -2,6 +2,7 @@ import { schoolHolidayCatalogRepo } from '../../repo/schoolHolidayCatalogRepo'
 import apiClient from '../../api/client'
 import { useSettingsStore } from '../../store/settingsStore'
 import { SCHOOL_HOLIDAY_COUNTRY_CONFIG } from '../../vacay/schoolHolidayCountries'
+import { importChunk } from '../../utils/chunkReload'
 
 // Loads the subdivision (state/region) options for a holiday-calendar country.
 //
@@ -23,7 +24,7 @@ export async function fetchRegionOptions(country: string): Promise<{ value: stri
     // that get a region picker at all. Deliberately inside the try — if the chunk
     // fails, the result is the same empty array as a failed request, rather than an
     // unhandled rejection in the two callers that only do .then(setRegions).
-    const iso31662 = (await import('iso-3166-2')).default
+    const iso31662 = (await importChunk(() => import('iso-3166-2'))).default
 
     const opts = new Map<string, string>() // ISO code -> display name
     const sub = iso31662.country(country)?.sub || {}
diff --git a/client/src/i18n/TranslationContext.tsx b/client/src/i18n/TranslationContext.tsx
index 492bd7043..4ee437cdf 100644
--- a/client/src/i18n/TranslationContext.tsx
+++ b/client/src/i18n/TranslationContext.tsx
@@ -11,6 +11,7 @@ import {
   sanitizeInlineHtml,
 } from '@trek/shared'
 import type { TranslationStrings } from '@trek/shared/i18n'
+import { importChunk } from '../utils/chunkReload'
 
 export { SUPPORTED_LANGUAGES }
 
@@ -122,7 +123,7 @@ export function TranslationProvider({ children }: TranslationProviderProps) {
     if (!loader) return
 
     let cancelled = false
-    loader().then(mod => {
+    importChunk(loader).then(mod => {
       if (!cancelled) setStrings(mod.default)
     }).catch(err => {
       // The locale chunk can be gone after a deploy. Keep the strings we have —
diff --git a/client/src/mobile/screens/trip/sheets/MExportSheet.tsx b/client/src/mobile/screens/trip/sheets/MExportSheet.tsx
index a607ac52d..73c34fc3e 100644
--- a/client/src/mobile/screens/trip/sheets/MExportSheet.tsx
+++ b/client/src/mobile/screens/trip/sheets/MExportSheet.tsx
@@ -11,6 +11,7 @@ import { hasPersonalPlan } from '../../../../components/PDF/pdfScope'
 import { INNER_CLS, TileHeader } from './MTripSheetUi'
 import type { MTripSheetsProps } from '../MTripShell'
 import type { LucideIcon } from 'lucide-react'
+import { importChunk } from '../../../../utils/chunkReload'
 
 /**
  * Export sheet ('export', opened from the Mehr sheet): the desktop day-plan
@@ -47,7 +48,7 @@ export default function MExportSheet({ planner, shell }: MTripSheetsProps) {
     setPdfBusy(mine ? 'mine' : 'all')
     try {
       // See DayPlanSidebarToolbar: loaded on demand, not with the trip.
-      const { downloadTripPDF } = await import('../../../../components/PDF/TripPDF')
+      const { downloadTripPDF } = await importChunk(() => import('../../../../components/PDF/TripPDF'))
       await downloadTripPDF({
         trip: planner.trip,
         days: planner.days,
diff --git a/client/src/utils/chunkReload.test.ts b/client/src/utils/chunkReload.test.ts
index 535a27322..96e964aa6 100644
--- a/client/src/utils/chunkReload.test.ts
+++ b/client/src/utils/chunkReload.test.ts
@@ -1,4 +1,4 @@
-import { isChunkLoadError, reloadOnceForChunk, clearChunkReloadMarker, reloadFresh, FRESH_LOAD_PARAM } from './chunkReload';
+import { isChunkLoadError, reloadOnceForChunk, clearChunkReloadMarker, reloadFresh, importChunk, FRESH_LOAD_PARAM } from './chunkReload';
 
 const net = vi.hoisted(() => ({
   probeNow: vi.fn(async () => 'online' as 'online' | 'offline' | 'proxy-wall'),
@@ -83,6 +83,18 @@ describe('reloadFresh', () => {
 describe('reloadOnceForChunk', () => {
   const stubReload = () => stubLocation().reload;
 
+  it('FE-UTIL-CHUNK-020: importChunk reloads once for a chunk the deploy removed, and still hands the caller the error', async () => {
+    const reload = stubReload();
+    const gone = new TypeError('Failed to fetch dynamically imported module: /assets/TripPDF-abc123.js');
+    await expect(importChunk(() => Promise.reject(gone))).rejects.toBe(gone);
+    expect(reload).toHaveBeenCalledTimes(1);
+
+    // Anything else is the caller's error alone.
+    await expect(importChunk(() => Promise.reject(new Error('pdf layout failed')))).rejects.toThrow('pdf layout failed');
+    expect(reload).toHaveBeenCalledTimes(1);
+    await expect(importChunk(() => Promise.resolve({ ok: true }))).resolves.toEqual({ ok: true });
+  });
+
   it('FE-UTIL-CHUNK-004: reloads the first time and refuses afterwards', () => {
     const reload = stubReload();
     expect(reloadOnceForChunk()).toBe(true);
diff --git a/client/src/utils/chunkReload.ts b/client/src/utils/chunkReload.ts
index 35e646fea..7afb93258 100644
--- a/client/src/utils/chunkReload.ts
+++ b/client/src/utils/chunkReload.ts
@@ -116,3 +116,19 @@ export function clearChunkReloadMarker(): void {
     // Nothing to clear if storage is unavailable.
   }
 }
+
+/**
+ * A dynamic import whose failure the caller catches. After a deploy the old
+ * page asks for chunk names the new build no longer has; a caller that only
+ * shows its own error would show it on every retry, so a missing chunk reloads
+ * onto the current build once, the way an uncaught one already does. The
+ * error is rethrown for the caller either way.
+ */
+export async function importChunk<T>(load: () => Promise<T>): Promise<T> {
+  try {
+    return await load()
+  } catch (err) {
+    if (isChunkLoadError(err)) reloadOnceForChunk()
+    throw err
+  }
+}