The other day I swapped out the theme here because the upcoming Twenty Twenty One theme was introduced. It is still being developed and worked on so that means I do expect some of the things on here to break. I’m used to things breaking though.
For those who do want to either follow along with the development or contributing then I would recommend going to: https://github.com/wordpress/twentytwentyone
The other thing I’m trying to do is follow along with the notifications project. Reason being I do want to contribute to this one more. The WordPress notification system is something that has been needed for a long time. If you want to contribute to that, please go to: https://github.com/WordPress/wp-notify
The team does also meet every Monday morning in Slack if you wanted to chime in as well.