Forge Tunnelling fails to load React app

Hi friends,

I have followed the guide on how to Tunnel with Custom UI (https://developer.atlassian.com/platform/forge/tunneling/), and I have reached the point where my docker logs are emitting this message:

Received proxy request. Serving file index.html for resource main from specified address http://localhost:3000

I have started the tunnelling by running forge tunnel from the root directory, and started my create-react-server from static/hello-world by running npm start.

When I run the app inside Confluence, I get the following in the console logs and network logs

The app works fine in Confluence without forge tunnel running in the background (as it is just reading off the static built files uploaded using forge deploy).

Running the following versions:
node: v14.20.0
forge: 5.0.0
docker: 20.10.17, build 100c701

Any luck with resolving or update on this?

Thanks,
Fredrik