What I’ve tried and what’s not working:
The “Rich Text” component is not displaying seem to be getting a “component does not exist” error. Maybe its not implemented in the latest standalone app server?
I’ve moved this to bug reports. Your theory is correct. The app-server and anvil.works are very closely aligned, however the app-server is often slightly behind anvil.works. The app-server should be updated soon.
RichText is so new that it hasn’t yet been officially announced.