autoCodeSplitting on Rsbuild breaks source maps

Which project does this relate to?

Router

Describe the bug

When Rspack is used and autoCodeSplitting is enabled, the source map generated does not match the original file. The issue is gone when autoCodeSplitting is disabled.

Your Example Website or App

https://github.com/TanStack/router/tree/main/examples/react/quickstart-rspack-file-based

Steps to Reproduce the Bug or Issue

1. Add debugger statement to src/routes/index.tsx
2. Use launch profile on VSCode

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "type": "chrome",
            "request": "launch",
            "name": "Launch Chrome against localhost",
            "url": "http://localhost:3000",
            "webRoot": "${workspaceFolder}"
        }
    ]
}

3. Visit the site and check where it breaks

Expected behavior

The debugger should breaks at the exact point of the debugger statement.

Screenshots or Videos

Platform

• OS: Windows
• Browser: Chrome
• Version: 134.0.6998.118

Additional context

tanstack-router-react-example-quickstart-rspack-file-based@ D:\router\examples\react\quickstart-rspack-file-based
├── @rsbuild/core@1.2.4
├── @rsbuild/plugin-react@1.1.0
├── @tanstack/react-router-devtools@1.114.27
├── @tanstack/react-router@1.114.27
├── @tanstack/router-plugin@1.114.27
├── @types/react-dom@19.0.4
├── @types/react@19.0.12
├── autoprefixer@10.4.21
├── postcss@8.5.3
├── react-dom@19.0.0
├── react@19.0.0
├── tailwindcss@3.4.17
└── typescript@5.8.2

Reproduce the issue in examples/react/quickstart-rspack-file-based using Rspack with autoCodeSplitting enabled. Start with src/routes/index.tsx and the provided VS Code Chrome launch profile, then compare the debugger location with the debugger statement; done means source maps pause at the exact original source position.