Cannot find module '@workflow/world-postgres'

I followed the instructions in https://useworkflow.dev/docs/deploying/world/postgres-world. I'm using Next.js 16.1.1. Deployed to Vercel (Node 24). got this error when I called the end point:

2025-12-26 09:20:40.395 [info] Starting Postgres World...
2025-12-26 09:20:40.395 [info] Failed to prepare server Error: An error occurred while loading instrumentation hook: Cannot find module '@workflow/world-postgres'
Require stack:
- /var/task/index.js
    at <unknown> (../../opt/rust/nodejs.js:2:13529)
    at Module.dn (../../opt/rust/nodejs.js:2:13907)
    at Je.e.<computed>.ze._load (../../opt/rust/nodejs.js:2:13499) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [Array]
}
2025-12-26 09:20:40.395 [info] Failed to prepare server Error: An error occurred while loading instrumentation hook: Cannot find module '@workflow/world-postgres'
Require stack:
- /var/task/index.js
    at <unknown> (../../opt/rust/nodejs.js:2:13529)
    at Module.dn (../../opt/rust/nodejs.js:2:13907)
    at Je.e.<computed>.ze._load (../../opt/rust/nodejs.js:2:13499) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [Array]
}
2025-12-26 09:20:40.400 [error] Error: An error occurred while loading instrumentation hook: Cannot find module '@workflow/world-postgres'
Require stack:
- /var/task/index.js
    at <unknown> (../../opt/rust/nodejs.js:2:13529)
    at Module.dn (../../opt/rust/nodejs.js:2:13907)
    at Je.e.<computed>.ze._load (../../opt/rust/nodejs.js:2:13499) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [Array]
}

Same thing with Redis world. The only way I can use workflow is with Vercel World in Pro plan. Hobby plan doesn't work which is annoying.

The packages:

npm list
my-workflow-next-app@0.1.0 
├── @emnapi/core@1.7.1 extraneous
├── @emnapi/runtime@1.7.1 extraneous
├── @emnapi/wasi-threads@1.1.0 extraneous
├── @napi-rs/wasm-runtime@0.2.12 extraneous
├── @tailwindcss/postcss@4.1.18
├── @tybys/wasm-util@0.10.1 extraneous
├── @types/node@20.19.27
├── @types/react-dom@19.2.3
├── @types/react@19.2.7
├── @workflow/world-postgres@4.1.0-beta.23
├── eslint-config-next@16.1.1
├── eslint@9.39.2
├── next@16.1.1
├── react-dom@19.2.3
├── react@19.2.3
├── tailwindcss@4.1.18
├── typescript@5.9.3
└── workflow@4.0.1-beta.36

Start by reproducing the documented Postgres World setup in a Next.js 16.1.1 app deployed to Vercel on Node 24, then inspect how the instrumentation hook loads @workflow/world-postgres and the Redis world. Done means the documented worlds work on the reported deployment plan without the MODULE_NOT_FOUND error.