There is an error pictured in the attachments. Here is how you can reproduce this from a vanilla repo and a vanilla codespace:
- Command Shift P and type "Add Development Container Configuration Files"
- --> Show All Definitions
- --> GitHub Codespaces (Default)
- --> Check the box Select Additional Features to Install
The screenshots appearing below exist on both VS code installed locally and running within the browser, so I am pretty sure this falls in the realm of responsibility of the team that manages the VS Code Codespaces Extension. I am not sure how to provide feedback to that team.

