diff --git a/tests/integration/cache-handler.test.ts b/tests/integration/cache-handler.test.ts
index b3910f8e62..7eaf6b70c5 100644
--- a/tests/integration/cache-handler.test.ts
+++ b/tests/integration/cache-handler.test.ts
@@ -17,7 +17,10 @@ import {
   getBlobEntries,
   startMockBlobStore,
 } from '../utils/helpers.js'
-import { nextVersionSatisfies } from '../utils/next-version-helpers.mjs'
+import {
+  nextVersionSatisfies,
+  shouldHaveAppRouterNotFoundInPrerenderManifest,
+} from '../utils/next-version-helpers.mjs'
 
 // Disable the verbose logging of the lambda-local runtime
 getLogger().level = 'alert'
@@ -212,14 +215,17 @@ describe('app router', () => {
     console.timeEnd('runPlugin')
     // check if the blob entries where successful set on the build plugin
     const blobEntries = await getBlobEntries(ctx)
-    expect(blobEntries.map(({ key }) => decodeBlobKey(key)).sort()).toEqual([
-      '/404',
-      '/index',
-      '/posts/1',
-      '/posts/2',
-      '404.html',
-      '500.html',
-    ])
+    expect(blobEntries.map(({ key }) => decodeBlobKey(key)).sort()).toEqual(
+      [
+        '/404',
+        shouldHaveAppRouterNotFoundInPrerenderManifest() ? '/_not-found' : undefined,
+        '/index',
+        '/posts/1',
+        '/posts/2',
+        '404.html',
+        '500.html',
+      ].filter(Boolean),
+    )
 
     // test the function call
     const post1 = await invokeFunction(ctx, { url: 'posts/1' })
@@ -362,23 +368,26 @@ describe('plugin', () => {
     await runPlugin(ctx)
     // check if the blob entries where successful set on the build plugin
     const blobEntries = await getBlobEntries(ctx)
-    expect(blobEntries.map(({ key }) => decodeBlobKey(key)).sort()).toEqual([
-      '/404',
-      '/api/revalidate-handler',
-      '/api/static/first',
-      '/api/static/second',
-      '/api/zero-length-response',
-      '/index',
-      '/product/事前レンダリング,test',
-      '/revalidate-fetch',
-      '/static-fetch-1',
-      '/static-fetch-2',
-      '/static-fetch-3',
-      '/static-fetch/1',
-      '/static-fetch/2',
-      '404.html',
-      '500.html',
-    ])
+    expect(blobEntries.map(({ key }) => decodeBlobKey(key)).sort()).toEqual(
+      [
+        '/404',
+        shouldHaveAppRouterNotFoundInPrerenderManifest() ? '/_not-found' : undefined,
+        '/api/revalidate-handler',
+        '/api/static/first',
+        '/api/static/second',
+        '/api/zero-length-response',
+        '/index',
+        '/product/事前レンダリング,test',
+        '/revalidate-fetch',
+        '/static-fetch-1',
+        '/static-fetch-2',
+        '/static-fetch-3',
+        '/static-fetch/1',
+        '/static-fetch/2',
+        '404.html',
+        '500.html',
+      ].filter(Boolean),
+    )
   })
 })
 
diff --git a/tests/integration/simple-app.test.ts b/tests/integration/simple-app.test.ts
index 6fc02f387c..f70eed2871 100644
--- a/tests/integration/simple-app.test.ts
+++ b/tests/integration/simple-app.test.ts
@@ -34,7 +34,10 @@ import {
   getBlobEntries,
   startMockBlobStore,
 } from '../utils/helpers.js'
-import { nextVersionSatisfies } from '../utils/next-version-helpers.mjs'
+import {
+  nextVersionSatisfies,
+  shouldHaveAppRouterNotFoundInPrerenderManifest,
+} from '../utils/next-version-helpers.mjs'
 
 const mockedCp = cp as Mock<(typeof import('node:fs/promises'))['cp']>
 
@@ -95,26 +98,29 @@ test<FixtureTestContext>('Test that the simple next app is working', async (ctx)
   await runPlugin(ctx)
   // check if the blob entries where successful set on the build plugin
   const blobEntries = await getBlobEntries(ctx)
-  expect(blobEntries.map(({ key }) => decodeBlobKey(key)).sort()).toEqual([
-    '/404',
-    '/api/cached-permanent',
-    '/api/cached-revalidate',
-    '/config-redirect',
-    '/config-redirect/dest',
-    '/config-rewrite',
-    '/config-rewrite/dest',
-    '/image/local',
-    '/image/migration-from-v4-runtime',
-    '/image/remote-domain',
-    '/image/remote-pattern-1',
-    '/image/remote-pattern-2',
-    '/index',
-    '/other',
-    '/route-resolves-to-not-found',
-    '404.html',
-    '500.html',
-    'fully-static.html',
-  ])
+  expect(blobEntries.map(({ key }) => decodeBlobKey(key)).sort()).toEqual(
+    [
+      '/404',
+      shouldHaveAppRouterNotFoundInPrerenderManifest() ? '/_not-found' : undefined,
+      '/api/cached-permanent',
+      '/api/cached-revalidate',
+      '/config-redirect',
+      '/config-redirect/dest',
+      '/config-rewrite',
+      '/config-rewrite/dest',
+      '/image/local',
+      '/image/migration-from-v4-runtime',
+      '/image/remote-domain',
+      '/image/remote-pattern-1',
+      '/image/remote-pattern-2',
+      '/index',
+      '/other',
+      '/route-resolves-to-not-found',
+      '404.html',
+      '500.html',
+      'fully-static.html',
+    ].filter(Boolean),
+  )
 
   // test the function call
   const home = await invokeFunction(ctx)
@@ -385,12 +391,15 @@ test.skipIf(process.env.NEXT_VERSION !== 'canary')<FixtureTestContext>(
     await runPlugin(ctx)
     // check if the blob entries where successful set on the build plugin
     const blobEntries = await getBlobEntries(ctx)
-    expect(blobEntries.map(({ key }) => decodeBlobKey(key)).sort()).toEqual([
-      '/404',
-      '/index',
-      '404.html',
-      '500.html',
-    ])
+    expect(blobEntries.map(({ key }) => decodeBlobKey(key)).sort()).toEqual(
+      [
+        '/404',
+        shouldHaveAppRouterNotFoundInPrerenderManifest() ? '/_not-found' : undefined,
+        '/index',
+        '404.html',
+        '500.html',
+      ].filter(Boolean),
+    )
 
     // test the function call
     const home = await invokeFunction(ctx)
diff --git a/tests/utils/next-version-helpers.mjs b/tests/utils/next-version-helpers.mjs
index b462517b21..b9bffcc28c 100644
--- a/tests/utils/next-version-helpers.mjs
+++ b/tests/utils/next-version-helpers.mjs
@@ -24,6 +24,20 @@ export function nextVersionSatisfies(condition) {
   return satisfies(checkVersion, condition, { includePrerelease: true }) || version === condition
 }
 
+export function isNextCanary() {
+  return [process.env.NEXT_RESOLVED_VERSION, process.env.NEXT_VERSION].some((tagOrVersionOrEmpty) =>
+    tagOrVersionOrEmpty?.includes('canary'),
+  )
+}
+
+export function shouldHaveAppRouterNotFoundInPrerenderManifest() {
+  // https://github.com/vercel/next.js/pull/82199
+
+  // The canary versions are out of band, as there stable/latest patch versions higher than base of canary versions
+  // and change was not backported to stable versions
+  return nextVersionSatisfies('>=15.4.2-canary.33') && isNextCanary()
+}
+
 /**
  * Check if current next version requires React 19
  * @param {string} version Next version