experimental.bundledDev fails in TanStack Start

[nestarz]

Which project does this relate to?

Start

Describe the bug

When enabling Vite 8's new full bundle mode via experimental.bundledDev: true inside a TanStack Start architecture, the development server fails to resolve CSS, and to enable HMR or Javascript.

Complete minimal reproducer

https://github.com/nestarz/tanstack-start-mre-bundled-dev

Steps to Reproduce the Bug

1. Run pnpm dev
2. Go to url
3. See no css applied
4. Try to edit
5. See no HMR

Expected behavior

I should see HMR and CSS applied, and javascript should work

Screenshots or Videos

No response

Platform

• Router / Start Version: 1.168.6
• OS: macOS
• Browser: all
• Bundler: vite
• Bundler: 8.0.0

Additional context

No response

[schiller-manuel]

fixed in #7482