Stackblitz v4 issue template does not launch sample application

[KilianB]

What you were expecting:

Opening the v4 issue template I would expect a sample application to start up

What happened instead:

A blank white screen.

Steps to reproduce:

Navigate to https://stackblitz.com/github/marmelab/react-admin/tree/4.x/examples/simple

Other information:

Stopping the dev server in the terminal, calling npm run build and npm run serve works fine

Environment

• Browser: Chrome