When using the --debug flag to build, the web service is unable to start due to an issue with the "react-scripts start" command. It fails because both HOST in .env and proxy in package.json are defined.

Relevant issue: https://github.com/facebook/create-react-app/issues/11762

According to the linked issue, package named http-proxy-middleware has the ability to fix this, removing proxy from the package.json, allowing the "react-scripts start" command.