return null for 404 cached page in the incremental cache

[conico974]

This is a temp fix until it is properly fixed in OpenNext

[changeset-bot]

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Latest commit: 5b75810

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[github-actions]

Summary of the deployments:

Version 1

Version	URL	Status
Latest commit	https://d2297483.gitbook-open.pages.dev	✅
PR	https://pr3296.gitbook-open.pages.dev	✅

Version 2

Version	URL	Status
Vercel	https://gitbook-v2-orbkybcp0-gitbook.vercel.app	✅
Cloudflare	https://123f6e5b-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	v1	2v	2c
GitBook	https://d2297483.gitbook-open.pages.dev/gitbook.com/docs	https://gitbook-v2-orbkybcp0-gitbook.vercel.app/url/gitbook.com/docs	https://123f6e5b-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://d2297483.gitbook-open.pages.dev/gitbook.gitbook.io/test-gitbook-open	https://gitbook-v2-orbkybcp0-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://123f6e5b-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.gitbook.io/test-gitbook-open

[argos-ci]

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Build	Status	Details	Updated (UTC)
customers-v1 (Inspect)	✅ No changes detected	-	Jun 11, 2025, 10:49 AM
customers-v2 (Inspect)	👍 Changes approved	77 changed	Jun 11, 2025, 10:49 AM
default (Inspect)	✅ No changes detected	-	Jun 11, 2025, 10:50 AM
v2-cloudflare (Inspect)	✅ No changes detected	-	Jun 11, 2025, 10:52 AM
v2-vercel (Inspect)	✅ No changes detected	-	Jun 11, 2025, 10:52 AM

[SamyPesse]

I don't fully get this one, but trust you

[conico974]

I don't fully get this one, but trust you

FYI, returning null means that we ignore the cache for this one. This is probably what we want to do anyway for 404 on cache interception