Steps to reproduce:

1 - Create a jumpstart project using Headless Acelerator and selecting Angular for the project.

2 - Creating a subpage to the default page by default.

Expected:

Green bars are rendered and allow you to insert components.

Outcome:

Page is blank and doesn't allow you to edit nor add components.

Workaround & notes:

Setting spaExtended as the renderType either on package.json or individually for each template, allows you to edit and insert components.

Also, creating a page or rendering it using spaExtended as renderType, allows you to edit it regardless of the renderType set afterwards (can switch to spa as renderType and it will work).