Build Hash For css not match when build using docker

Which project does this relate to?

Router

Describe the bug

Issue
When building a TanStack Start project normally (local build), the asset hashes are consistent and everything works as expected.

However, when building the same project inside a Docker container, there’s a mismatch in the hashed style assets. This causes a Flash of Unstyled Content (FOUC) on page load.

Your Example Website or App

https://github.com/killallskywalker/tanstack-reproduce-issue

Steps to Reproduce the Bug or Issue

1. Go to this repository - https://github.com/killallskywalker/tanstack-reproduce-issue
2. Run docker compose up
3. Open localhost:3000 then you can see the mismatch and the FOUC

However , if you do this
1 . npm run build
2 . node .output/server/index.mjs
3 . Open localhost:3000 then you can see all work nicely

Expected behavior

The asset hashes and generated style files should be identical regardless of build environment (local vs Docker) and no FOUC

Screenshots or Videos

Docker Image -

Local Build -

Platform

• Router / Start Version: [1.135.0]
• Bundler: [vite]
• Bundler Version: [7.2.2]
• Nitro V2 Plugin [1.133.19]

Additional context

Step to reproduce also attach in readme of repo .

Start with the linked tanstack-reproduce-issue repository and run docker compose up, then compare its output with npm run build followed by node .output/server/index.mjs. Inspect how the Vite and Nitro builds generate and reference CSS assets in Docker versus locally. Done means the hashes and generated style files match in both environments and the FOUC is gone.