Current Behavior: I am deploying a Next.js monorepo using Turborepo. I need to run the build from inside the app directory (frontend/)so that Turbo can correctly hash the local Vercel environment files located in apps/frontend/.vercel/.env.*.local. However, when I run vercel build from inside the frontend directory, Vercel appends the Project Setting "Root Directory" to the current path, resulting in a duplicate path error: Error: ENOENT: no such file or directory, lstat '.../Repo/frontend/frontend/.next/routes-manifest.json' Expected Behavior: When running vercel build from the directory configured as the "Root Directory", Vercel should detect that the context is already correct and look for artifacts in ./.next instead of appending the path again. Code, configuration, and steps that reproduce this issue

1. Directory Structure: / (Monorepo Root) ├── turbo.json ├ │ └── frontend/ (Configured as "Root Directory" in Vercel) │ ├── next.config.js (Standard, no distDir override) │ ├── .vercel/ (Contains .env.preview.local needed for Turbo inputs) │ └── package.json
2. turbo.json (Why I need to be in the folder): My build task relies on hashing the specific Vercel env files local to the app. JSON { "tasks": { "build": { "inputs": [ "$TURBO_DEFAULT$", ".vercel/.env.preview.local", ".vercel/.env.production.local" ], "outputs": [".next/", "!.next/cache/"] } } }
3. Steps to Reproduce: cd frontend npx vercel pull (Downloads env vars to frontend/.vercel) npx vercel build Result: Build succeeds via Turbo, but Vercel CLI fails to find the output because it looks in frontend/frontend/.next.
4. What I've tried: Running from Root: This fixes the path error, but Turbo fails to hash the environment files because they are nested inside frontend/.vercel and the root context doesn't see them as inputs correctly. Setting rootDirectory: null in project.json: Vercel forces the paths frontend/frontend/.next. If I set rootDirectory: test, it will be the correct path frontend/test Project information Framework: Next.js Build Tool: Turborepo Environment: Vercel CLI (Local Build) Project Settings: Framework Preset: Next.js Root Directory: frontend Output Directory: Default (Empty) Build Command: cd ../.. && npx turbo run build --filter=frontend

I run the turbo build command from the monorepo’s root folder