There’s an update out for macOS Catalina that addresses that:
- Improves installation reliability of macOS Catalina on Macs with low disk space
- Fixes an issue that prevented Setup Assistant from completing during some installations
- Resolves an issue that prevents accepting iCloud Terms and Conditions when multiple iCloud accounts are logged in
- Improves the reliability of saving Game Center data when playing Apple Arcade games offline
This is not macOS Catalina 10.15.1, but rather an update to the .0. It’s available in Software Update now.