Duplicated <meta> tags when hydration locale differs from SSG locale #6078
Description
Which project does this relate to?
Router
Describe the bug
Hi there 👋
Has anyone hit duplicated tags with TanStack Router head management when the hydration locale differs from the SSG locale?
Context: SSG renders meta tags in FR, on the client, i18n picks EN. <title> updates fine, but meta tags stay in FR and new EN metas are appended, so I end up with two of each. Looking at HeadContent source code, keys are generated from JSON.stringify(tag), which includes the meta content. That means React can’t reconcile the server meta with the client meta if content changes (different language), so it mounts a second node.
Has anyone solved this without hacks (like deleting prerendered metas on load)? Should HeadContent key metas by tag+name/property instead of stringify so hydration can reuse and update them? Happy to open an issue/PR if that’s the right direction.
Your Example Website or App
https://github.com/davidavz/start-basic-static
Steps to Reproduce the Bug or Issue
Run pnpm build + pnpm preview
Expected behavior
Check the DOM and you will see duplicated meta tags FR + EN
Screenshots or Videos
No response
Platform
- Router / Start Version: ^1.139.13
Additional context
No response