Repository: create-react-app
Issue: Incomplete `asset-manifest.json` generated by `npm run build`
Labels: needs triage,issue: bug report

### Describe the bug

Similar problem as in #8640 issue
https://github.com/facebook/create-react-app/issues/8640

I'm using `semantic-ui` components library, which has a lot of media assets.
`npm build` generates an incomplete `asset-manifest.json` file, but `npm start` works properly.

### Steps to reproduce

The same as in #8640 issue

### Expected behavior

```json
{
  "files": {
    "main.js": "/static/js/main.chunk.js",
    "main.js.map": "/static/js/main.chunk.js.map",
    "runtime-main.js": "/static/js/bundle.js",
    "runtime-main.js.map": "/static/js/bundle.js.map",
    "vendors~main.js": "/static/js/vendors~main.chunk.js",
    "vendors~main.js.map": "/static/js/vendors~main.chunk.js.map",
    "index.html": "/index.html",
    "static/media/brand-icons.woff2": "/static/media/brand-icons.278156e4.woff2", <----------
    "static/media/brand-icons.ttf": "/static/media/brand-icons.65a2fb6d.ttf", <----------
    "static/media/brand-icons.svg": "/static/media/brand-icons.6729d297.svg", <----------
    "static/media/brand-icons.woff": "/static/media/brand-icons.cac87dc0.woff", <----------
    "static/media/brand-icons.eot": "/static/media/brand-icons.d68fa3e6.eot", <----------
    "static/media/flags.png": "/static/media/flags.99f63ae7.png", <----------
    "static/media/icons.woff2": "/static/media/icons.38c6d8ba.woff2", <----------
    "static/media/icons.woff": "/static/media/icons.425399f8.woff", <----------
    "static/media/icons.svg": "/static/media/icons.62d9dae4.svg", <----------
    "static/media/icons.eot": "/static/media/icons.a01e3f2d.eot", <----------
    "static/media/icons.ttf": "/static/media/icons.c656b8ca.ttf", <----------
    "static/media/outline-icons.ttf": "/static/media/outline-icons.53671035.ttf", <----------
    "static/media/outline-icons.woff2": "/static/media/outline-icons.687a4990.woff2", <----------
    "static/media/outline-icons.eot": "/static/media/outline-icons.752905fa.eot", <----------
    "static/media/outline-icons.svg": "/static/media/outline-icons.9c4845b4.svg", <----------
    "static/media/outline-icons.woff": "/static/media/outline-icons.ddae9b1b.woff" <----------
  },
  "entrypoints": [
    "static/js/bundle.js",
    "static/js/vendors~main.chunk.js",
    "static/js/main.chunk.js"
  ]
}
```

### Actual behavior

```json
{
  "files": {
    "main.css": "./static/css/main.d801c8a7.chunk.css",
    "main.js": "./static/js/main.39a76e80.chunk.js",
    "main.js.map": "./static/js/main.39a76e80.chunk.js.map",
    "runtime-main.js": "./static/js/runtime-main.020a40f2.js",
    "runtime-main.js.map": "./static/js/runtime-main.020a40f2.js.map",
    "static/css/2.3a5c9e01.chunk.css": "./static/css/2.3a5c9e01.chunk.css",
    "static/js/2.9c33af20.chunk.js": "./static/js/2.9c33af20.chunk.js",
    "static/js/2.9c33af20.chunk.js.map": "./static/js/2.9c33af20.chunk.js.map",
    "index.html": "./index.html",
    "static/css/2.3a5c9e01.chunk.css.map": "./static/css/2.3a5c9e01.chunk.css.map",
    "static/css/main.d801c8a7.chunk.css.map": "./static/css/main.d801c8a7.chunk.css.map",
    "static/js/2.9c33af20.chunk.js.LICENSE.txt": "./static/js/2.9c33af20.chunk.js.LICENSE.txt",
    "static/media/semantic.min.css": "./static/media/outline-icons.ddae9b1b.woff" <---------- 
  },
  "entrypoints": [
    "static/js/runtime-main.020a40f2.js",
    "static/css/2.3a5c9e01.chunk.css",
    "static/js/2.9c33af20.chunk.js",
    "static/css/main.d801c8a7.chunk.css",
    "static/js/main.39a76e80.chunk.js"
  ]
}
```