The error occurs if you manually check for updates and update to v11 is downloaded and installed after a reboot. The error doesn't occur if you upgrade to v11 via an msi installer which contains the latest version of the Configuration module 2109.2. This module is also downloaded if you switch to the pre-release update channel (a reboot will be required for the firewall to load properly).
On Monday we plan to release a newer version of the Configuration module 2109.2 on the regular update channel.
