Netlify deploy fails with JSONHTTPError: Internal Server Error

[thelazyoxymoron]

Describe the bug

Getting this error when trying to deploy a site using netlify deploy --alias some-new-branch-name -m "some commit":

❯ Context
✔ Finished uploading blobs to deploy store
✔ No cached functions were found
✔ Finished hashing
⠏ CDN diffing files... ›   Warning: JSONHTTPError:  500
 ›   Warning:
{
  "name": "JSONHTTPError",
  "status": 500,
  "json": {
    "error": "unexpected return"
  }
}

 ›   JSONHTTPError: Internal Server Error

Steps to reproduce

1. Run netlify deploy --alias some-new-branch-name -m "some commit"
2. Get error

Configuration

No response

Environment

System:
    OS: macOS 15.2
    CPU: (10) arm64 Apple M1 Max
    Memory: 26.61 GB / 64.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 18.20.2 - ~/.nvm/versions/node/v18.20.2/bin/node
    Yarn: 1.22.21 - ~/.nvm/versions/node/v18.20.2/bin/yarn
    npm: 10.8.1 - ~/.nvm/versions/node/v18.20.2/bin/npm
    pnpm: 9.15.3 - ~/.nvm/versions/node/v18.20.2/bin/pnpm
    bun: 1.1.43 - /opt/homebrew/bin/bun
    Watchman: 2024.12.02.00 - /opt/homebrew/bin/watchman
  npmPackages:
    netlify-cli: ^18.0.0 => 18.0.0