Which project does this relate to?

Router

Describe the bug

When client side navigating to a page that has a parent layout, and the layout loads data (throuh Tanstack Query) slower than the page, then the page fails to render.

Hard reload of the page gets it into a working state.

Your Example Website or App

https://github.com/jakst/tss-search-params-undefined-repro

Steps to Reproduce the Bug or Issue

1. Start dev server
2. Open http://localhost:3000
3. Click the "👉 To page2" link
4. Notice that only the header renders, not the page content for page2

Expected behavior

I expect the page to render properly

Screenshots or Videos

No response

Platform

• Router / Start Version: 1.168.19
• OS: MacOS
• Browser: Chrome
• Browser Version: 147
• Bundler: vite
• Bundler Version: 8.0.8

Additional context

No response