How to reproduce bugs in Codesandbox?

[zvictor]

I am trying to reproduce a bug in Codesandbox but I came to the conclusion that it must be performing customisations on top of the next dev that interfere on the behaviour I want to reproduce.

I noticed that the exact same code in my machine would show the Prerendered page badge, but in Codesandbox it would not. Checking window.__NEXT_DATA__ confirms my suspicions.

Codesandbox:

dev machine:

Why aren't autoExport and nextExport present in any of the Codesandbox exports?

[timneutkens]

Sounds like it's just an old version of Next.js 🤔

[zvictor]

I am using next.js 9.4.2, here is the link: https://codesandbox.io/s/multiple-head-tags-80u9i?file=/pages/index.js