build --watch does not output html or css when @vitejs/plugin-legacy is used

### Describe the bug

Vite does not output html or css when the `@vitejs/plugin-legacy` plugin is used


Possibly related to #3279 but that issue was closed

### Reproduction

https://stackblitz.com/edit/vite-c4bxea?devtoolsheight=33

Reproducible by running `vite build --watch`

### System Info

```shell
❯ npx envinfo --system --npmPackages '{vite,@vitejs/*}' --binaries --browsers
success Install finished in 1.067s


  System:
    OS: Linux undefined
    CPU: (4) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: Unknown - /bin/jsh
  Binaries:
    Node: 14.16.0 - /usr/local/bin/node
    Yarn: 1.22.10 - /bin/yarn
    npm: 7.17.0 - /bin/npm
  npmPackages:
    @vitejs/plugin-legacy: ^1.6.4 => 1.6.4 
    vite: ^2.6.0 => 2.7.2
```


### Used Package Manager

npm

### Logs

```shell
❯ vite build --watch --debug
  vite:config bundled config file loaded in 561.00ms +0ms
  vite:config using resolved config: {
  vite:config   plugins: [
  vite:config     'alias',
  vite:config     'vite:modulepreload-polyfill',
  vite:config     'vite:resolve',
  vite:config     'vite:html-inline-script-proxy',
  vite:config     'vite:css',
  vite:config     'vite:esbuild',
  vite:config     'vite:json',
  vite:config     'vite:wasm',
  vite:config     'vite:worker',
  vite:config     'vite:asset',
  vite:config     'vite:legacy-config',
  vite:config     'vite:legacy-generate-polyfill-chunk',
  vite:config     'vite:legacy-env',
  vite:config     'vite:define',
  vite:config     'vite:css-post',
  vite:config     'vite:watch-package-data',
  vite:config     'vite:build-html',
  vite:config     'commonjs',
  vite:config     'vite:data-uri',
  vite:config     'rollup-plugin-dynamic-import-variables',
  vite:config     'vite:asset-import-meta-url',
  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   build: {
  vite:config     target: [ 'es2019', 'edge88', 'firefox78', 'chrome87', 'safari13.1' ],
  vite:config     polyfillModulePreload: true,
  vite:config     outDir: '/home/projects/vite-c4bxea/dist',
  vite:config     assetsDir: 'assets',
  vite:config     assetsInlineLimit: 4096,
  vite:config     cssCodeSplit: true,
  vite:config     cssTarget: 'chrome61',
  vite:config     sourcemap: true,
  vite:config     rollupOptions: { input: '/home/projects/vite-c4bxea/index.html', output: [Array] },
  vite:config     minify: 'terser',
  vite:config     terserOptions: {},
  vite:config     write: true,
  vite:config     emptyOutDir: null,
  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: true,
  vite:config     brotliSize: true,
  vite:config     w: true,
  vite:config     commonjsOptions: { include: [Array], extensions: [Array] },
  vite:config     dynamicImportVarsOptions: { warnOnError: true, exclude: [Array] }
  vite:config   },
  vite:config   define: { 'import.meta.env.LEGACY': '__VITE_IS_LEGACY__' },
  vite:config   configFile: '/home/projects/vite-c4bxea/vite.config.js',
  vite:config   configFileDependencies: [ '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     build: { watch: true, w: true }
  vite:config   },
  vite:config   root: '/home/projects/vite-c4bxea',
  vite:config   base: '/',
  vite:config   resolve: { dedupe: undefined, alias: [ [Object], [Object] ] },
  vite:config   publicDir: '/home/projects/vite-c4bxea/public',
  vite:config   cacheDir: '/home/projects/vite-c4bxea/node_modules/.vite',
  vite:config   command: 'build',
  vite:config   mode: 'production',
  vite:config   isProduction: true,
  vite:config   server: { fs: { strict: true, allow: [Array], deny: [Array] } },
  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   },
  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   optimizeDeps: {
  vite:config     esbuildOptions: { keepNames: undefined, preserveSymlinks: undefined }
  vite:config   }
  vite:config } +8ms
vite v2.7.2 building for production...

watching for file changes...

build started...
✓ 4 modules transformed.
rendering chunks (1)...[@vitejs/plugin-legacy] legacy polyfills: Set(5) {
  'core-js/modules/es.promise',
  'core-js/modules/es.array.iterator',
  'core-js/modules/es.array.iterator.js',
  'core-js/modules/web.dom-collections.iterator.js',
  'core-js/modules/es.promise.js'
}
  vite:config using resolved config: {
  vite:config   root: '/home/projects/vite-c4bxea/node_modules/@vitejs/plugin-legacy',
  vite:config   configFile: undefined,
  vite:config   logLevel: 'error',
  vite:config   plugins: [
  vite:config     'alias',
  vite:config     'vite:modulepreload-polyfill',
  vite:config     'vite:resolve',
  vite:config     'vite:html-inline-script-proxy',
  vite:config     'vite:css',
  vite:config     'vite:esbuild',
  vite:config     'vite:json',
  vite:config     'vite:wasm',
  vite:config     'vite:worker',
  vite:config     'vite:asset',
  vite:config     'vite:legacy-polyfills',
  vite:config     'vite:define',
  vite:config     'vite:css-post',
  vite:config     'vite:watch-package-data',
  vite:config     'vite:build-html',
  vite:config     'commonjs',
  vite:config     'vite:data-uri',
  vite:config     'rollup-plugin-dynamic-import-variables',
  vite:config     'vite:asset-import-meta-url',
  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   build: {
  vite:config     target: false,
  vite:config     polyfillModulePreload: true,
  vite:config     outDir: '/home/projects/vite-c4bxea/node_modules/@vitejs/plugin-legacy/dist',
  vite:config     assetsDir: 'assets',
  vite:config     assetsInlineLimit: 4096,
  vite:config     cssCodeSplit: true,
  vite:config     cssTarget: false,
  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     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   },
  vite:config   configFileDependencies: [],
  vite:config   inlineConfig: {
  vite:config     root: '/home/projects/vite-c4bxea/node_modules/@vitejs/plugin-legacy',
  vite:config     configFile: false,
  vite:config     logLevel: 'error',
  vite:config     plugins: [ [Object] ],
  vite:config     build: {
  vite:config       write: false,
  vite:config       target: false,
  vite:config       minify: 'terser',
  vite:config       assetsDir: 'assets',
  vite:config       rollupOptions: [Object]
  vite:config     }
  vite:config   },
  vite:config   base: '/',
  vite:config   resolve: { dedupe: undefined, alias: [ [Object], [Object] ] },
  vite:config   publicDir: '/home/projects/vite-c4bxea/node_modules/@vitejs/plugin-legacy/public',
  vite:config   cacheDir: '/home/projects/vite-c4bxea/node_modules/@vitejs/plugin-legacy/node_modules/.vite',
  vite:config   command: 'build',
  vite:config   mode: 'production',
  vite:config   isProduction: true,
  vite:config   server: { fs: { strict: true, allow: [Array], deny: [Array] } },
  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   },
  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   optimizeDeps: {
  vite:config     esbuildOptions: { keepNames: undefined, preserveSymlinks: undefined }
  vite:config   }
  vite:config } +2s
rendering chunks (2)...[vite:build-html] No corresponding legacy polyfill chunk found for /home/projects/vite-c4bxea/index.html
dist/assets/index-legacy.5c4c0183.js       0.49 KiB / gzip: 0.36 KiB
dist/assets/index-legacy.5c4c0183.js.map   0.37 KiB
dist/assets/polyfills-legacy.ff863e63.js   30.00 KiB / gzip: 12.50 KiB
```


### 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 https://github.com/vuejs/vue-next 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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build --watch does not output html or css when @vitejs/plugin-legacy is used #6133

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Uh oh!

build --watch does not output html or css when @vitejs/plugin-legacy is used #6133

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Describe the bug

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