Fix revalidate for initial notFound: true paths

[ijjk]

This fixes revalidation not occurring correctly when notFound: true is returned during build, additional tests have been added to ensure this is working correctly for dynamic and non-dynamic pages returning notFound: true during build and then revalidating afterwards.

Bug

• Related issues linked using fixes #number
• Integration tests added
• Errors have helpful link attached, see contributing.md

Fixes: #21453

[ijjk]

Stats from current PR

Default Build (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	ijjk/next.js fix/initial-not-found	Change
buildDuration	13.5s	13.6s	⚠️ +36ms
buildDurationCached	3.4s	3.3s	-46ms
nodeModulesSize	49.1 MB	49.1 MB	⚠️ +484 B

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	ijjk/next.js fix/initial-not-found	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.636	2.614	-0.02
/ avg req/sec	948.29	956.21	+7.92
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.434	1.468	⚠️ +0.03
/error-in-render avg req/sec	1742.82	1702.54	⚠️ -40.28

Client Bundles (main, webpack, commons)

	vercel/next.js canary	ijjk/next.js fix/initial-not-found	Change
745.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42.2 kB	42.2 kB	✓
main-HASH.js gzip	23.1 kB	23.1 kB	✓
webpack-HASH.js gzip	1.44 kB	1.44 kB	✓
Overall change	67 kB	67 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ijjk/next.js fix/initial-not-found	Change
polyfills-a4..dd70.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	ijjk/next.js fix/initial-not-found	Change
_app-HASH.js gzip	980 B	980 B	✓
_error-HASH.js gzip	194 B	194 B	✓
amp-HASH.js gzip	312 B	312 B	✓
css-HASH.js gzip	329 B	329 B	✓
dynamic-HASH.js gzip	2.64 kB	2.64 kB	✓
head-HASH.js gzip	350 B	350 B	✓
hooks-HASH.js gzip	904 B	904 B	✓
image-HASH.js gzip	4.13 kB	4.13 kB	✓
index-HASH.js gzip	261 B	261 B	✓
link-HASH.js gzip	1.66 kB	1.66 kB	✓
routerDirect..HASH.js gzip	319 B	319 B	✓
script-HASH.js gzip	387 B	387 B	✓
withRouter-HASH.js gzip	320 B	320 B	✓
bb14e60e810b..30f.css gzip	125 B	125 B	✓
Overall change	12.9 kB	12.9 kB	✓

Client Build Manifests

	vercel/next.js canary	ijjk/next.js fix/initial-not-found	Change
_buildManifest.js gzip	491 B	491 B	✓
Overall change	491 B	491 B	✓

Rendered Page Sizes

	vercel/next.js canary	ijjk/next.js fix/initial-not-found	Change
index.html gzip	540 B	540 B	✓
link.html gzip	552 B	552 B	✓
withRouter.html gzip	532 B	532 B	✓
Overall change	1.62 kB	1.62 kB	✓

---

Webpack 4 Mode (Increase detected ⚠️)

General Overall increase ⚠️

	vercel/next.js canary	ijjk/next.js fix/initial-not-found	Change
buildDuration	11.1s	11.1s	-1ms
buildDurationCached	4.6s	4.6s	-28ms
nodeModulesSize	49.1 MB	49.1 MB	⚠️ +484 B

Page Load Tests Overall increase ✓

	vercel/next.js canary	ijjk/next.js fix/initial-not-found	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.689	2.669	-0.02
/ avg req/sec	929.74	936.82	+7.08
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.468	1.422	-0.05
/error-in-render avg req/sec	1702.78	1757.83	+55.05

Client Bundles (main, webpack, commons)

	vercel/next.js canary	ijjk/next.js fix/initial-not-found	Change
16.HASH.js gzip	186 B	186 B	✓
677f882d2ed8..HASH.js gzip	14 kB	14 kB	✓
framework.HASH.js gzip	41.9 kB	41.9 kB	✓
main-HASH.js gzip	10.6 kB	10.6 kB	✓
webpack-HASH.js gzip	1.19 kB	1.19 kB	✓
Overall change	67.9 kB	67.9 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ijjk/next.js fix/initial-not-found	Change
polyfills-a4..dd70.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	ijjk/next.js fix/initial-not-found	Change
_app-HASH.js gzip	965 B	965 B	✓
_error-HASH.js gzip	3.71 kB	3.71 kB	✓
amp-HASH.js gzip	552 B	552 B	✓
css-HASH.js gzip	333 B	333 B	✓
dynamic-HASH.js gzip	2.83 kB	2.83 kB	✓
head-HASH.js gzip	2.97 kB	2.97 kB	✓
hooks-HASH.js gzip	911 B	911 B	✓
index-HASH.js gzip	231 B	231 B	✓
link-HASH.js gzip	1.64 kB	1.64 kB	✓
routerDirect..HASH.js gzip	298 B	298 B	✓
script-HASH.js gzip	2.95 kB	2.95 kB	✓
withRouter-HASH.js gzip	294 B	294 B	✓
e025d2764813..52f.css gzip	125 B	125 B	✓
Overall change	17.8 kB	17.8 kB	✓

Client Build Manifests

	vercel/next.js canary	ijjk/next.js fix/initial-not-found	Change
_buildManifest.js gzip	497 B	497 B	✓
Overall change	497 B	497 B	✓

Rendered Page Sizes

	vercel/next.js canary	ijjk/next.js fix/initial-not-found	Change
index.html gzip	585 B	585 B	✓
link.html gzip	598 B	598 B	✓
withRouter.html gzip	579 B	579 B	✓
Overall change	1.76 kB	1.76 kB	✓

Commit: e83e9f7