title: Nuxt.js npm run build results in some JS files being not found
body: <p>I have a Nuxt.js <code>^2.10.2</code> App. </p>
  
  <p>When I do <code>npm run dev</code>, the project builds perfectly.</p>
  
  <p>When I do <code>npm run build</code> then <code>npm run start</code>. some JS files are getting 404 error.</p>
  
  <p><a href="https://i.stack.imgur.com/dpwcS.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dpwcS.png" alt="enter image description here"></a></p>
  
  <pre><code>ERROR
  
  Request URL: http://localhost:3000/_nuxt/vendors.pages/account.pages/ca.pages/cart.pages/category/_id/
  index.pages/checkout/_step/index.pages/.f705ad4d.1-0-128.js
  Request Method: GET
  Status Code: 404 Not Found
  Remote Address: 127.0.0.1:3000
  Referrer Policy: no-referrer-when-downgrade
  </code></pre>
  
  <p>The file exists on my project in <code>dist/_nuxt/vendor.pages/......</code> with the correct filename <code>.f705ad4d.1-0-128.js</code></p>
  
  <p>my <code>nuxt.config.js</code> </p>
  
  <pre><code>build: {,
      filenames: {
          app: '[name].' + version + '.js',
          chunk: '[name].' + version + '.js',
          vendor: '[name].' + version + '.js',
          manifest: '[name].' + version + '.js',
      },
  }
  </code></pre>
  
  <p>What am I doing wrong? As other files are loaded as normal.</p>