[BUG] Error: Dynamic require of "/.next/server/pages/api/hello.js" is not supported

[jeff-polls]

Describe the bug

500 error when pinging API routes in cloudflare preview mode, works when running next dev

I'm using the latest starter template with no changes:
yarn create cloudflare my-next-app --framework=next --experimental

I'm on a mac running Ventura, tried on node 20 and 22.

Steps to reproduce

yarn create cloudflare my-next-app --framework=next --experimental

Then run yarn preview

I can see the static page in the browser (although images and icons are broken), but when I try to ping the /api/hello endpoint I get a 500.

Expected behavior

The API routes in the example project should work

@opennextjs/cloudflare version

0.5.8

Wrangler version

3.114.0

next info output

✘ [ERROR] ⨯ Error: Dynamic require of "/.next/server/pages/api/hello.js" is not supported

Additional context

No response