React integration not working with v6.0.0-beta.56

[himat]

Preflight Checklist

• I have read the contribution documentation for this project.
• I agree to follow the code of conduct that this project follows, as appropriate.
• I have searched the issue tracker for a bug that matches the one I want to file, without success.

Issue Details

• Electron Forge Version: v6.0.0-beta.56
• Electron Version: v13.1.2
• Operating System: MacOS 10.14.5
• Last Known Working Electron Forge version:: NA

Expected Behavior

I originally created a new forge boilerplate project using the webpack-typescript option which gave me v6.0.0-beta.57.
But then due to the big bug reported here will-stone/browserosaurus#408, I couldn't actually compile the project since I couldn't import electron in the renderer process.
So then I downgraded to beta.56 as suggested.
I did this by doing rm -rf node_modules/ and then changed these lines in my package.json devDependencies to be 56

@electron-forge/cli: 6.0.0-beta.56,
@electron-forge/maker-deb: 6.0.0-beta.56,
@electron-forge/maker-rpm: 6.0.0-beta.56,
@electron-forge/maker-squirrel: 6.0.0-beta.56,
@electron-forge/maker-zip: 6.0.0-beta.56,
@electron-forge/plugin-webpack: 6.0.0-beta.56,

And then I did yarn install.

Actual Behavior

The code compiles now, but for some reason when I do yarn start, the contents of index.html show up and it's not replaced by the contents of my app.tsx.
I created this new project originally by doing npx create-electron-app my-new-app --template=typescript-webpack and then I followed the instructions to add react https://www.electronforge.io/guides/framework-integration/react-with-typescript.
My react app showed up originally when I was on 57, but now not on 56.

I uploaded the repo I made here if you'd like to try it yourself: https://github.com/himat/example
It's just your basic template with the example react code added.

Alternatively, can you let me know what the latest stable version of electron forge I can use instead is?