The `[name]-legacy-[hash].js` file generated by vite@4.x and @vitejs/plugin-legacy does not have a sourcemap

### Describe the bug

`vite@4.x` could not generate a soucemap file for the `[filename]-legacy-[hash].js` file generated by `@vitejs/plugin-legacy`, but `vite@3.x` could successfully generate the corresponding sourcemap file.

I'm not sure if it's `vite` or `@vitejs/plugin-legacy` that's causing this problem. 

I've listed two links to reproduce it below. One uses `vite@4.0.4` and the other uses `vite@3.2.5`. Both versions of `@vitejs/plugin-legacy` are 3.0.1. They have the exact same configuration, and I didn't forget to add `sourcemap: true` to the configuration file.

### Reproduction

https://stackblitz.com/edit/vitejs-v4-sourcemap-issue?file=package.json

### Steps to reproduce

- Run `npm run build`
- Check the generated files in `dist/assets/`
- `index-[hash].js` has a sourcemap file named `index-[hash].js.map`. But there is no sourcemap file for `index-legacy-[hash].js`. (even though Vite lists its size in output for me)

The sourcemap file corresponding to `index-legacy-[hash].js` in `vite@3.2.5` can be successfully generated. You can check the reproduction link located at https://stackblitz.com/edit/vitejs-v3-sourcemap-issue?file=package.json

### System Info

```shell
  System:
    OS: macOS 12.6
    CPU: (8) arm64 Apple M1
    Memory: 275.42 MB / 16.00 GB
    Shell: 5.8.1 - /bin/zsh
  Binaries:
    Node: 16.18.0 - ~/.nvm/versions/node/v16.18.0/bin/node
    Yarn: 1.22.19 - /opt/homebrew/bin/yarn
    npm: 8.19.2 - ~/.nvm/versions/node/v16.18.0/bin/npm
  Browsers:
    Safari: 16.1
  npmPackages:
    @vitejs/plugin-legacy: ^3.0.1 => 3.0.1
    @vitejs/plugin-react: ^3.0.1 => 3.0.1
    vite: ^4.0.4 => 4.0.4
```


### Used Package Manager

npm


### Logs

<details>
<summary>Click to expand!</summary>

```shell
$ vite build --debug
  vite:config bundled config file loaded in 663.24ms +0ms
  vite:esbuild init tsconfck (root: /home/projects/vitejs-vite-edjzfv) +0ms
  vite:esbuild init tsconfck (root: /home/projects/vitejs-vite-edjzfv) +1ms
  vite:esbuild init tsconfck (root: /home/projects/vitejs-vite-edjzfv) +0ms
  vite:esbuild init tsconfck (root: /home/projects/vitejs-vite-edjzfv) +1ms
  vite:esbuild init tsconfck end +0ms
  vite:esbuild init tsconfck end +0ms
  vite:esbuild init tsconfck end +0ms
  vite:esbuild init tsconfck end +0ms
  vite:config using resolved config: {
  vite:config   build: {
  vite:config     target: [ 'es2020', 'edge79', 'firefox67', 'chrome64', 'safari11.1' ],
  vite:config     cssTarget: 'chrome61',
  vite:config     outDir: 'dist',
  vite:config     assetsDir: 'assets',
  vite:config     assetsInlineLimit: 4096,
  vite:config     cssCodeSplit: true,
  vite:config     sourcemap: true,
  vite:config     rollupOptions: { output: [Array] },
  vite:config     minify: 'esbuild',
  vite:config     terserOptions: {},
  vite:config     write: true,
  vite:config     emptyOutDir: null,
  vite:config     copyPublicDir: true,
  vite:config     manifest: false,
  vite:config     lib: false,
  vite:config     ssr: false,
  vite:config     ssrManifest: false,
  vite:config     reportCompressedSize: true,
  vite:config     chunkSizeWarningLimit: 500,
  vite:config     watch: null,
  vite:config     commonjsOptions: { include: [Array], extensions: [Array] },
  vite:config     dynamicImportVarsOptions: { warnOnError: true, exclude: [Array] },
  vite:config     modulePreload: { polyfill: true }
  vite:config   },
  vite:config   plugins: [
  vite:config     'vite:build-metadata',
  vite:config     'vite:pre-alias',
  vite:config     'alias',
  vite:config     'vite:react-babel',
  vite:config     'vite:react-refresh',
  vite:config     'vite:react-jsx',
  vite:config     'vite:modulepreload-polyfill',
  vite:config     'vite:resolve',
  vite:config     'vite:html-inline-proxy',
  vite:config     'vite:css',
  vite:config     'vite:esbuild',
  vite:config     'vite:json',
  vite:config     'vite:wasm-helper',
  vite:config     'vite:worker',
  vite:config     'vite:asset',
  vite:config     'vite:legacy-config',
  vite:config     'vite:legacy-generate-polyfill-chunk',
  vite:config     'vite:wasm-fallback',
  vite:config     'vite:define',
  vite:config     'vite:css-post',
  vite:config     'vite:build-html',
  vite:config     'vite:worker-import-meta-url',
  vite:config     'vite:asset-import-meta-url',
  vite:config     'vite:force-systemjs-wrap-complete',
  vite:config     'vite:watch-package-data',
  vite:config     'commonjs',
  vite:config     'vite:data-uri',
  vite:config     'vite:dynamic-import-vars',
  vite:config     'vite:import-glob',
  vite:config     'vite:legacy-post-process',
  vite:config     'vite:build-import-analysis',
  vite:config     'vite:esbuild-transpile',
  vite:config     'vite:terser',
  vite:config     'vite:reporter',
  vite:config     'vite:load-fallback'
  vite:config   ],
  vite:config   optimizeDeps: {
  vite:config     disabled: 'build',
  vite:config     force: undefined,
  vite:config     include: [ 'react/jsx-runtime', 'react/jsx-dev-runtime', 'react' ],
  vite:config     esbuildOptions: { preserveSymlinks: false }
  vite:config   },
  vite:config   esbuild: {
  vite:config     jsxDev: false,
  vite:config     jsx: 'automatic',
  vite:config     jsxImportSource: undefined,
  vite:config     jsxSideEffects: false
  vite:config   },
  vite:config   resolve: {
  vite:config     mainFields: [ 'module', 'jsnext:main', 'jsnext' ],
  vite:config     browserField: true,
  vite:config     conditions: [],
  vite:config     extensions: [
  vite:config       '.mjs',  '.js',
  vite:config       '.mts',  '.ts',
  vite:config       '.jsx',  '.tsx',
  vite:config       '.json'
  vite:config     ],
  vite:config     dedupe: [ 'react', 'react-dom' ],
  vite:config     preserveSymlinks: false,
  vite:config     alias: [ [Object], [Object] ]
  vite:config   },
  vite:config   define: { 'import.meta.env.LEGACY': '__VITE_IS_LEGACY__' },
  vite:config   configFile: '/home/projects/vitejs-vite-edjzfv/vite.config.js',
  vite:config   configFileDependencies: [ '/home/projects/vitejs-vite-edjzfv/vite.config.js' ],
  vite:config   inlineConfig: {
  vite:config     root: undefined,
  vite:config     base: undefined,
  vite:config     mode: undefined,
  vite:config     configFile: undefined,
  vite:config     logLevel: undefined,
  vite:config     clearScreen: undefined,
  vite:config     optimizeDeps: { force: undefined },
  vite:config     build: {}
  vite:config   },
  vite:config   root: '/home/projects/vitejs-vite-edjzfv',
  vite:config   base: '/',
  vite:config   rawBase: '/',
  vite:config   publicDir: '/home/projects/vitejs-vite-edjzfv/public',
  vite:config   cacheDir: '/home/projects/vitejs-vite-edjzfv/node_modules/.vite',
  vite:config   command: 'build',
  vite:config   mode: 'production',
  vite:config   ssr: {
  vite:config     format: 'esm',
  vite:config     target: 'node',
  vite:config     optimizeDeps: { disabled: true, esbuildOptions: [Object] }
  vite:config   },
  vite:config   isWorker: false,
  vite:config   mainConfig: null,
  vite:config   isProduction: true,
  vite:config   server: {
  vite:config     preTransformRequests: true,
  vite:config     middlewareMode: false,
  vite:config     fs: { strict: true, allow: [Array], deny: [Array] }
  vite:config   },
  vite:config   preview: {
  vite:config     port: undefined,
  vite:config     strictPort: undefined,
  vite:config     host: undefined,
  vite:config     https: undefined,
  vite:config     open: undefined,
  vite:config     proxy: undefined,
  vite:config     cors: undefined,
  vite:config     headers: undefined
  vite:config   },
  vite:config   env: { BASE_URL: '/', MODE: 'production', DEV: false, PROD: true },
  vite:config   assetsInclude: [Function: assetsInclude],
  vite:config   logger: {
  vite:config     hasWarned: false,
  vite:config     info: [Function: info],
  vite:config     warn: [Function: warn],
  vite:config     warnOnce: [Function: warnOnce],
  vite:config     error: [Function: error],
  vite:config     clearScreen: [Function: clearScreen],
  vite:config     hasErrorLogged: [Function: hasErrorLogged]
  vite:config   },
  vite:config   packageCache: Map(0) { set: [Function (anonymous)] },
  vite:config   createResolver: [Function: createResolver],
  vite:config   worker: {
  vite:config     format: 'iife',
  vite:config     plugins: [
  vite:config       'vite:build-metadata',
  vite:config       'vite:pre-alias',
  vite:config       'alias',
  vite:config       'vite:modulepreload-polyfill',
  vite:config       'vite:resolve',
  vite:config       'vite:html-inline-proxy',
  vite:config       'vite:css',
  vite:config       'vite:esbuild',
  vite:config       'vite:json',
  vite:config       'vite:wasm-helper',
  vite:config       'vite:worker',
  vite:config       'vite:asset',
  vite:config       'vite:wasm-fallback',
  vite:config       'vite:define',
  vite:config       'vite:css-post',
  vite:config       'vite:build-html',
  vite:config       'vite:worker-import-meta-url',
  vite:config       'vite:asset-import-meta-url',
  vite:config       'vite:force-systemjs-wrap-complete',
  vite:config       'vite:watch-package-data',
  vite:config       'commonjs',
  vite:config       'vite:data-uri',
  vite:config       'vite:dynamic-import-vars',
  vite:config       'vite:import-glob',
  vite:config       'vite:build-import-analysis',
  vite:config       'vite:esbuild-transpile',
  vite:config       'vite:terser',
  vite:config       'vite:load-fallback'
  vite:config     ],
  vite:config     rollupOptions: {},
  vite:config     getSortedPlugins: [Function: getSortedPlugins],
  vite:config     getSortedPluginHooks: [Function: getSortedPluginHooks]
  vite:config   },
  vite:config   appType: 'spa',
  vite:config   experimental: { importGlobRestoreExtension: false, hmrPartialAccept: false },
  vite:config   getSortedPlugins: [Function: getSortedPlugins],
  vite:config   getSortedPluginHooks: [Function: getSortedPluginHooks]
  vite:config } +6ms
vite v4.0.4 building for production...
✓ 34 modules transformed.
rendering chunks (1)...[@vitejs/plugin-legacy] legacy polyfills: Set(40) {
  'core-js/modules/es.object.to-string.js',
  'core-js/modules/es.promise.js',
  'core-js/modules/es.symbol.js',
  'core-js/modules/es.symbol.description.js',
  'core-js/modules/es.symbol.iterator.js',
  'core-js/modules/es.array.iterator.js',
  'core-js/modules/es.string.iterator.js',
  'core-js/modules/web.dom-collections.iterator.js',
  'core-js/modules/es.object.assign.js',
  'core-js/modules/es.error.cause.js',
  'core-js/modules/es.regexp.exec.js',
  'core-js/modules/es.string.replace.js',
  'core-js/modules/es.regexp.to-string.js',
  'core-js/modules/es.array.push.js',
  'core-js/modules/es.object.keys.js',
  'core-js/modules/web.immediate.js',
  'core-js/modules/es.set.js',
  'core-js/modules/es.regexp.test.js',
  'core-js/modules/es.array.slice.js',
  'core-js/modules/es.string.match.js',
  'core-js/modules/es.string.trim.js',
  'core-js/modules/es.object.define-property.js',
  'core-js/modules/es.reflect.to-string-tag.js',
  'core-js/modules/es.reflect.construct.js',
  'core-js/modules/es.array.includes.js',
  'core-js/modules/es.string.includes.js',
  'core-js/modules/es.object.get-own-property-descriptor.js',
  'core-js/modules/web.dom-collections.for-each.js',
  'core-js/modules/es.array.index-of.js',
  'core-js/modules/es.regexp.flags.js',
  'core-js/modules/es.math.clz32.js',
  'core-js/modules/es.map.js',
  'core-js/modules/es.array.concat.js',
  'core-js/modules/es.array.unshift.js',
  'core-js/modules/web.queue-microtask.js',
  'core-js/modules/es.weak-map.js',
  'core-js/modules/es.weak-set.js',
  'core-js/modules/es.array.splice.js',
  'core-js/modules/es.json.stringify.js',
  'core-js/modules/es.array.from.js'
}
  vite:config using resolved config: {
  vite:config   mode: 'production',
  vite:config   root: '/home/projects/vitejs-vite-edjzfv/node_modules/@vitejs/plugin-legacy/dist',
  vite:config   configFile: undefined,
  vite:config   logLevel: 'error',
  vite:config   plugins: [
  vite:config     'vite:build-metadata',
  vite:config     'vite:pre-alias',
  vite:config     'alias',
  vite:config     'vite:modulepreload-polyfill',
  vite:config     'vite:resolve',
  vite:config     'vite:html-inline-proxy',
  vite:config     'vite:css',
  vite:config     'vite:json',
  vite:config     'vite:wasm-helper',
  vite:config     'vite:worker',
  vite:config     'vite:asset',
  vite:config     'vite:legacy-polyfills',
  vite:config     'vite:wasm-fallback',
  vite:config     'vite:define',
  vite:config     'vite:css-post',
  vite:config     'vite:build-html',
  vite:config     'vite:worker-import-meta-url',
  vite:config     'vite:asset-import-meta-url',
  vite:config     'vite:force-systemjs-wrap-complete',
  vite:config     'vite:watch-package-data',
  vite:config     'commonjs',
  vite:config     'vite:data-uri',
  vite:config     'vite:dynamic-import-vars',
  vite:config     'vite:import-glob',
  vite:config     'vite:build-import-analysis',
  vite:config     'vite:terser',
  vite:config     'vite:reporter',
  vite:config     'vite:load-fallback'
  vite:config   ],
  vite:config   build: {
  vite:config     target: [ 'es2020', 'edge88', 'firefox78', 'chrome87', 'safari14' ],
  vite:config     cssTarget: [ 'es2020', 'edge88', 'firefox78', 'chrome87', 'safari14' ],
  vite:config     outDir: 'dist',
  vite:config     assetsDir: 'assets',
  vite:config     assetsInlineLimit: 4096,
  vite:config     cssCodeSplit: true,
  vite:config     sourcemap: false,
  vite:config     rollupOptions: { input: [Object], output: [Object] },
  vite:config     minify: 'terser',
  vite:config     terserOptions: {},
  vite:config     write: false,
  vite:config     emptyOutDir: null,
  vite:config     copyPublicDir: true,
  vite:config     manifest: false,
  vite:config     lib: false,
  vite:config     ssr: false,
  vite:config     ssrManifest: false,
  vite:config     reportCompressedSize: true,
  vite:config     chunkSizeWarningLimit: 500,
  vite:config     watch: null,
  vite:config     commonjsOptions: { include: [Array], extensions: [Array] },
  vite:config     dynamicImportVarsOptions: { warnOnError: true, exclude: [Array] },
  vite:config     modulePreload: { polyfill: true }
  vite:config   },
  vite:config   esbuild: false,
  vite:config   optimizeDeps: {
  vite:config     disabled: 'build',
  vite:config     esbuildOptions: { preserveSymlinks: false, target: 'es5' }
  vite:config   },
  vite:config   configFileDependencies: [],
  vite:config   inlineConfig: {
  vite:config     mode: 'production',
  vite:config     root: '/home/projects/vitejs-vite-edjzfv/node_modules/@vitejs/plugin-legacy/dist',
  vite:config     configFile: false,
  vite:config     logLevel: 'error',
  vite:config     plugins: [ [Object] ],
  vite:config     build: {
  vite:config       write: false,
  vite:config       minify: 'terser',
  vite:config       assetsDir: 'assets',
  vite:config       rollupOptions: [Object]
  vite:config     },
  vite:config     esbuild: false,
  vite:config     optimizeDeps: { esbuildOptions: [Object] }
  vite:config   },
  vite:config   base: '/',
  vite:config   rawBase: '/',
  vite:config   resolve: {
  vite:config     mainFields: [ 'module', 'jsnext:main', 'jsnext' ],
  vite:config     browserField: true,
  vite:config     conditions: [],
  vite:config     extensions: [
  vite:config       '.mjs',  '.js',
  vite:config       '.mts',  '.ts',
  vite:config       '.jsx',  '.tsx',
  vite:config       '.json'
  vite:config     ],
  vite:config     dedupe: [],
  vite:config     preserveSymlinks: false,
  vite:config     alias: [ [Object], [Object] ]
  vite:config   },
  vite:config   publicDir: '/home/projects/vitejs-vite-edjzfv/node_modules/@vitejs/plugin-legacy/dist/public',
  vite:config   cacheDir: '/home/projects/vitejs-vite-edjzfv/node_modules/@vitejs/plugin-legacy/node_modules/.vite',
  vite:config   command: 'build',
  vite:config   ssr: {
  vite:config     format: 'esm',
  vite:config     target: 'node',
  vite:config     optimizeDeps: { disabled: true, esbuildOptions: [Object] }
  vite:config   },
  vite:config   isWorker: false,
  vite:config   mainConfig: null,
  vite:config   isProduction: true,
  vite:config   server: {
  vite:config     preTransformRequests: true,
  vite:config     middlewareMode: false,
  vite:config     fs: { strict: true, allow: [Array], deny: [Array] }
  vite:config   },
  vite:config   preview: {
  vite:config     port: undefined,
  vite:config     strictPort: undefined,
  vite:config     host: undefined,
  vite:config     https: undefined,
  vite:config     open: undefined,
  vite:config     proxy: undefined,
  vite:config     cors: undefined,
  vite:config     headers: undefined
  vite:config   },
  vite:config   env: { BASE_URL: '/', MODE: 'production', DEV: false, PROD: true },
  vite:config   assetsInclude: [Function: assetsInclude],
  vite:config   logger: {
  vite:config     hasWarned: false,
  vite:config     info: [Function: info],
  vite:config     warn: [Function: warn],
  vite:config     warnOnce: [Function: warnOnce],
  vite:config     error: [Function: error],
  vite:config     clearScreen: [Function: clearScreen],
  vite:config     hasErrorLogged: [Function: hasErrorLogged]
  vite:config   },
  vite:config   packageCache: Map(0) { set: [Function (anonymous)] },
  vite:config   createResolver: [Function: createResolver],
  vite:config   worker: {
  vite:config     format: 'iife',
  vite:config     plugins: [
  vite:config       'vite:build-metadata',
  vite:config       'vite:pre-alias',
  vite:config       'alias',
  vite:config       'vite:modulepreload-polyfill',
  vite:config       'vite:resolve',
  vite:config       'vite:html-inline-proxy',
  vite:config       'vite:css',
  vite:config       'vite:json',
  vite:config       'vite:wasm-helper',
  vite:config       'vite:worker',
  vite:config       'vite:asset',
  vite:config       'vite:wasm-fallback',
  vite:config       'vite:define',
  vite:config       'vite:css-post',
  vite:config       'vite:build-html',
  vite:config       'vite:worker-import-meta-url',
  vite:config       'vite:asset-import-meta-url',
  vite:config       'vite:force-systemjs-wrap-complete',
  vite:config       'vite:watch-package-data',
  vite:config       'commonjs',
  vite:config       'vite:data-uri',
  vite:config       'vite:dynamic-import-vars',
  vite:config       'vite:import-glob',
  vite:config       'vite:build-import-analysis',
  vite:config       'vite:terser',
  vite:config       'vite:load-fallback'
  vite:config     ],
  vite:config     rollupOptions: {},
  vite:config     getSortedPlugins: [Function: getSortedPlugins],
  vite:config     getSortedPluginHooks: [Function: getSortedPluginHooks]
  vite:config   },
  vite:config   appType: 'spa',
  vite:config   experimental: { importGlobRestoreExtension: false, hmrPartialAccept: false },
  vite:config   getSortedPlugins: [Function: getSortedPlugins],
  vite:config   getSortedPluginHooks: [Function: getSortedPluginHooks]
  vite:config } +2s
dist/assets/polyfills-legacy-7338514e.js   66.02 kB │ gzip: 27.12 kB
dist/assets/index-legacy-6a8fcc90.js      145.45 kB │ gzip: 46.98 kB │ map: 351.98 kB
dist/index.html                   1.70 kB
dist/assets/react-35ef61ed.svg    4.13 kB
dist/assets/index-ac565ccf.css    1.44 kB │ gzip:  0.75 kB
dist/assets/index-1dca1a01.js   143.74 kB │ gzip: 46.29 kB │ map: 349.61 kB
```
</details>

### Validations

- [X] Follow our [Code of Conduct](https://github.com/vitejs/vite/blob/main/CODE_OF_CONDUCT.md)
- [X] Read the [Contributing Guidelines](https://github.com/vitejs/vite/blob/main/CONTRIBUTING.md).
- [X] Read the [docs](https://vitejs.dev/guide).
- [X] Check that there isn't [already an issue](https://github.com/vitejs/vite/issues) that reports the same bug to avoid creating a duplicate.
- [X] Make sure this is a Vite issue and not a framework-specific issue. For example, if it's a Vue SFC related bug, it should likely be reported to [vuejs/core](https://github.com/vuejs/core) instead.
- [X] Check that this is a concrete bug. For Q&A open a [GitHub Discussion](https://github.com/vitejs/vite/discussions) or join our [Discord Chat Server](https://chat.vitejs.dev/).
- [X] The provided reproduction is a [minimal reproducible example](https://stackoverflow.com/help/minimal-reproducible-example) of the bug.

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Uh oh!

The `[name]-legacy-[hash].js` file generated by vite@4.x and @vitejs/plugin-legacy does not have a sourcemap #11693

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Uh oh!

The [name]-legacy-[hash].js file generated by vite@4.x and @vitejs/plugin-legacy does not have a sourcemap #11693

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The `[name]-legacy-[hash].js` file generated by vite@4.x and @vitejs/plugin-legacy does not have a sourcemap #11693