When I bootstrap a new project using the latest version and documentation, and then add some properties to the homepage.xml or render some text in the homepage.html.twig nothing changes.
In homepage.xml I added this
<property name="header" type="media_selection">
<meta>
<title lang="en">Header</title>
</meta>
</property>
directly below the article property, and when I go to the admin page, the header doesn't show up.
Same thing with small changes to the twig file. When I dump the content var there, nothing shows up.
Any ideas on what the problem might be?