vite preview cmd fails using build lib in config

[dave52]

Describe the bug

vite build's sucessfully but when trying to preview with vite preview demo page shows a Cannot GET /

Perhaps previewing isn't compatible with build.lib?, please let me know if this is the case. Also the vite build command isn't producing any errors.

Discovered this locally after setting up the Vite supplied lit-ts template, but also able to recreate on the Stackblitz demo. Seemed to have isolated it to when a vite.config.ts build.lib is setup.

Recreating

1. Open https://stackblitz.com/edit/vitejs-vite-9hjpr5?file=package.json&terminal=dev
2. npm run build
3. npx vite preview
4. Should produce Cannot GET / error

Reproduction

https://stackblitz.com/edit/vitejs-vite-9hjpr5?file=package.json&terminal=dev

System Info

Local:
Windows 10 64, Powershell, PNPM

Stackblitz:
Defaults, NPM

Used Package Manager

pnpm

Logs

No response

Validations

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[bluwy]

Duplicate of #7009