Hi everyone, I've been working on a simple proof of concept project for a while now and I wanted to deploy it on vercel. I've previously gotten the build output API to work and I think I understand the gist of it. That is why I'm particularly surprised this time, when I try deploying an already build nodejs project from a package in a monorepo. And it's telling me that a dependency which is used in another package cannot be found.
Here's the current error I'm getting:

Meanwhile the dependency in question isn't even in the package.json of the backend package.json

Steps to reproduce:
Just run
pnpm run deploy
in the backend folder
Here's the link to the project: https://github.com/adophilus/rust-playground/tree/main/solana-playground/bootcamp-2023/mini-projects/1-ai-nft-generator