Fix cache race condition

[conico974]

Address a race condition in the cache implementation of GBO 2c.

When revalidating a tag, the middleware could actually repopulate the cache before reaching the server cache and thus cause the tag cache to be bypassed in the server making the cache entry stale.

[linear]

RND-8452 Updates aren't showing up on published content

[changeset-bot]

⚠️ No Changeset found

Latest commit: 8aa0dc1

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[github-actions]

Summary of the deployments:

Version	URL	Status
Vercel	https://gitbook-v2-egwnti1b6-gitbook.vercel.app	✅
Cloudflare	https://98d3229f-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	2v	2c
GitBook	https://gitbook-v2-egwnti1b6-gitbook.vercel.app/url/gitbook.com/docs	https://98d3229f-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://gitbook-v2-egwnti1b6-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://98d3229f-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.gitbook.io/test-gitbook-open

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Build	Status	Details	Updated (UTC)
customers-v2 (Inspect)	👍 Changes approved	1 changed	Oct 17, 2025, 5:01 PM
v2-cloudflare (Inspect)	👍 Changes approved	4 changed	Oct 17, 2025, 5:06 PM
v2-vercel (Inspect)	👍 Changes approved	1 changed	Oct 17, 2025, 5:03 PM