Nested Header Links (h2) do not work when page(md) contain script tag

[ShighGoing]

• I confirm that this is a issue rather than a question.

Bug report

Version

vuepress@1.0.0-alpha.27

Steps to reproduce

1. Initialize the docs according to the guidelines

2. Create a config file with the following content

module.exports = {
  themeConfig: {
    nav: [
      { text: 'Home', link: '/' },
      { text: 'Guide', link: '/guide/' },
      { text: 'External', link: 'https://google.com' },
    ],
    sidebar: {
      '/guide/': ['', 'page-a']
    }
  }
}

3. Add test page with the following content

# page A

## title1

## title2

## title3

// Add title until the scroll bar appears

<script>
export default {
  props: ['slot-key'] // workaround for other issue
}
</script>

What is expected?

Click h2 title and navigate to the correct location

What is actually happening?

Click title but no corresponding

Other relevant information

reproduction repo

• Your OS: window 10
• Node.js version: 10.13.0
• Browser version: Version 70.0.3538.110
• Is this a global or local install? local
• Which package manager did you use for the install? yarn