Next.js Activity does not work on iOS

[VortexHero]

When using Next.js with the Embedded App SDK, this error gets thrown when running the Activity on iOS:

Application error: a client-side exception has occurred (see the browser console for more information).

This issue is happening only on Discord for iOS, not on the browser, the desktop app, or Android.

• This is reproducible when creating a new Next.js app using create-next-app.
• I am using App Router.
• I have changed nothing after initializing the base app from the CLI.
• I am using the latest stable version of Discord on iOS.
• I am using Cloudflare Tunnel for testing.

I also can not seem to see the logs for the Activity in Discord when following these steps, so I do not know what the console errors specifically are.