List of steps to reproduce (step by step, including full links if applicable):

• go to https://www.wikidata.org/wiki/Wikidata:Project_chat
• click the “Add topic” tab (between the “Edit” tabs and the “View history” tab)

Or:

• go to https://www.wikidata.org/w/index.php?title=Wikidata:Project_chat&section=new&veaction=editsource

What happens?:
Nothing, apparently; there is an error in the console, but it might not be related, since it already appears before clicking the tab:

Uncaught TypeError: can't access property "parentNode", startMarker is null
        newFromJSON
        newFromAnnotatedNodes
        init
        …

What should have happened instead?:
A new section should become available for editing.

Software version (if not a Wikimedia wiki), browser information, screenshots, other information, etc.:
Firefox Developer Edition 98; MediaWiki 1.38.0-wmf.23; VisualEditor 0.1.2 (e9f8ffa)