Environment

• Nuxt: ^4.1.2
• Nitro: 2.12.6
• Node.js: 22.x (Vercel)
• Package manager and version: [email protected]
• Deployment target: Vercel

Reproduction

1. Add route rules to nuxt.config.ts

  routeRules: {
    '/schedule': {
      isr: 60 * 5,
    }
  },

2. Deploy on Vercel (vercel preset + fluid computed enabled)

3. Navigate to:

• previewurl.com/schedule -> doesn't work 🚨
• previewurl.com/schedule/ -> does work
• client side navigation to /schedule -> does work

Describe the bug

• I'm using Nuxt route rules to enable ISR for the /schedule route.
• Client-side navigation (clicking a link to /schedule) works: first hit generates the page, subsequent hits are served from cache as expected.
• Direct navigation (typing the URL in the browser or hard-refresh) fails: the server redirects to /schedule-isr, which returns 404.

Additional context

This Reddit user seems to be facing the same issue: https://www.reddit.com/r/Nuxt/comments/1nik9nz/comment/ng61w70/?context=1

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