JS modules are loaded twice

Bug report

Describe the bug

JS modules seem to be loaded twice

To Reproduce

Steps to reproduce the behavior:

1. Go to ‘https://www.nextjs.org’ (or your own built site)
2. Click on ‘developer console’ in e.g. Chrome
3. See Network tab
4. Do a hard refresh (E.g. CTRL + SHIFT + R)
5. Sort resources by name
6. Look at loaded JS modules. They appear twice in the resource list, but are not retrieved from cache

Expected behavior

All required resources to be loaded just once.

Screenshots

System information

• OS: Ubuntu Linux
• Browser Chrome
• Version of Next.js: 9.1.1 - 9.3.0

Additional context

When disabling granular loading in next.js config, the issue seems resolved.

    experimental: {
      granularChunks: false,
      css: false
    }

[andrei-svistunou]

Hi @Timer ,

I still can reproduce this issue on a lot of sites, including nextjs.org

Could you, please, clarify this behaviour? Is it expected?

[helfi92]

We’re seeing the same behavior as well on the latest version of Next.js 10.0.6