Vite V6 - [Environment API] build.assetsDir is not fully respected in the client environment

[CaptinKraken]

I'm using React Router as a...

framework

Reproduction

https://stackblitz.com/edit/github-fnjseyom?file=vite.config.ts

Run npm run build and look at the output

System Info

System:
    OS: Linux 5.0 undefined
    CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  Binaries:
    Node: 20.19.0 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 10.8.2 - /usr/local/bin/npm
    pnpm: 8.15.6 - /usr/local/bin/pnpm
  npmPackages:
    @react-router/dev: * => 7.5.1 
    @react-router/node: * => 7.5.1 
    @react-router/serve: * => 7.5.1 
    react-router: * => 7.5.1 
    vite: ^6.0.11 => 6.3.2

Used Package Manager

npm

Expected Behavior

I expect the assetsDir to be respected, for all client output files.

Instead, this is only achieved by also specifying the environment.client.build.assetsDir and having it match the build.assetsDir

Actual Behavior

[CaptinKraken]

The Vite docs highlight that the top level build config should be inherited, if an environment specific config isn't specified https://vite.dev/guide/api-environment#:~:text=when%20not%20explicitly%20documented%2C%20environment%20inherits%20the%20configured%20top-level%20config