context resets to the initial value in the production environment

[alinayebi9080]

I encountered a problem while using the Next.js App Router (version 14.2.6). The issue occurs only in the production environment. it works perfectly fine in the local environment.

I'm using Context API to manage the state in my Next.js application. After saving data and using router.push to navigate to another page, the context value gets reset to its initial state. The strange part is that this issue only occurs in the production environment. In the local (development) environment, everything works fine.

What's even more puzzling is that when I navigate to a previous page and then try again, or if I refresh the page, the context behaves as expected.

At first, I thought this might be a problem with Context API, so I switched to using Zustand, but the same issue occurs. Given this, I suspect the issue might be related to the differences in optimization and rendering behavior between the development and production environments in Next.js App Router.

[icyJoseph]

Have you been able to profile this?

Does it behave the same way with a next build + start, locally? If so, then you could make a build with profiler enabled.

Run your build with --help, to see how to activate profile mode. I'd be interested to know if your context is remounting. You can see in the React Dev tools, when a component, "mounted for the first time", then that'd explain the reset to initial value. Otherwise, it could be a problem with your implementation.

[alinayebi9080]

It is because the parent layout is re-rendered, and the context used in the layout is recreated.
It's seems a bug in app router

[icyJoseph]

What's the path to this layout? Is it the root layout? I remember some cases where the layout does a render pass, like setting cookies in server actions. Would want to know more about this.