Microsoft have released an update to Windows 10 20H1 on the beta channel. Windows Feature Experience Pack 120.2212.3030.0 is available for Windows Insiders with devices on the beta channel that have stayed on 20H1 and not switched to 21H1. Windows Insiders on 21H1 should get the update soon.
UPDATE: The update is also rolling out to 21H1 devices.
The update contains just the one change:
We are improving the reliability of the handwriting input panel.
Microsoft are testing out distributing feature updates via the Experience Packs as way of delivering new features.