Release 6.4.10

docs/release-notes/6.4.10/changelog.ai.txt

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+AI Context: 6.4.10 Changelog (changelog.mdx)
+
+This file tracks manual edits made after the generation script ran.
+The script reads the "Skipped PRs" section to avoid re-adding removed entries.
+
+## Skipped PRs
+
+## Manual Rewrites

docs/release-notes/6.4.10/changelog.mdx

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+---
+id: oonhncbe
+title: Webiny 6.4.10 Changelog
+description: See what's new in Webiny version 6.4.10
+---
+
+import { GithubRelease } from "@/components/GithubRelease";
+import { Alert } from "@/components/Alert";
+
+<GithubRelease version={"6.4.10"} />
+
+## Webiny SDK
+
+### Fixed Unchecked Result Access Causing Cryptic Errors ([#5625](https://github.com/webiny/webiny-js/pull/5625))
+{/* REVIEW-PENDING @brunozoric — confirm this entry, then delete this line */}
+
+When using the Result pattern internally, accessing `.value` on a failed result would break code execution with no meaningful error message. All Result values are now properly checked before access, preventing these cryptic failures and improving error handling throughout the codebase.
+
+## Website Builder
+
+### Fixed Grid Column Stacking Flash on SSR ([#5628](https://github.com/webiny/webiny-js/pull/5628))
+{/* REVIEW-PENDING @adrians5j — confirm this entry, then delete this line */}
+
+Grid columns configured to stack at a specific breakpoint would briefly render side-by-side on page load before snapping to stacked layout — or stay broken entirely if the content didn't hydrate. This happened because stacking was resolved in JavaScript after hydration, not from the actual viewport width.
+
+Stacking is now applied via a scoped CSS media query rendered in the HTML, so the browser applies the correct layout immediately based on viewport width — no JavaScript required, no layout flash.

docs/release-notes/6.4.10/upgrade-guide.mdx

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+---
+id: uyky71zl
+title: Upgrade from 6.4.x to 6.4.10
+description: Learn how to upgrade Webiny from 6.4.x to 6.4.10.
+---
+
+import { Alert } from "@/components/Alert";
+import { AdditionalNotes } from "@/components/upgrade/AdditionalNotes";
+
+<Alert type="success" title="What you'll learn">
+
+- how to upgrade Webiny from 6.4.x to 6.4.10
+
+</Alert>
+
+<Alert type="info">
+
+Make sure to check out the [6.4.10 changelog](./changelog) to get familiar with the changes introduced in this release.
+
+</Alert>
+
+## Step-by-Step Guide
+
+### 1. Upgrade Webiny Packages
+
+Upgrade all Webiny packages by running the following command:
+
+```bash
+yarn webiny upgrade 6.4.10 --debug
+```
+
+Note that the command above will run upgrades for all available versions of Webiny up to 6.4.10. If there are upgrades for 6.4.1, 6.4.5, they will be ran.
+
+You can omit the version to upgrade to the latest available:
+
+```bash
+yarn webiny upgrade --debug
+```
+
+Once the upgrade has finished, running the `yarn webiny --version` command in your terminal should return **6.4.10**.
+
+<Alert type="info">
+
+If the above command fails or is not available in your setup, you can run the upgrade script directly via `npx`:
+
+```bash
+npx https://github.com/webiny/webiny-upgrades-v6 6.4.10 --debug
+```
+
+</Alert>
+
+### 2. Deploy Your Project
+
+Proceed by redeploying your Webiny project:
+
+```bash
+# Execute in your project root.
+yarn webiny deploy --env {environment}
+```
+
+<AdditionalNotes />