In this PnP Webcast, we concentrate on debugging options with SharePoint Framework solutions. There are numerous ways to perform debugging when developing SharePoint Framework solutions. In this webcast we wanted to cover few different optiosn and also show in practice how to setup F5 debugging experience in Visual Studio Code for your SharePoint Framework solution.
The article mentions this step for debugging the local workbench:
gulp serve --nobrowser
I found I cannot debug the Hosted workbench without running the gulp command as well. Might be worth mentioning that explicitly in the "Debug SharePoint Framework solution using hosted workbench" section of the article.