Update error (usbguard reportedly missing in dom0?)

Testing repos are disabled. But the following error prevents the system from updating.

 Problem: problem with installed package qubes-core-dom0-linux-4.1.16-1.fc32.x86_64
  - cannot install the best update candidate for package qubes-core-dom0-linux-4.1.16-1.fc32.x86_64
  - nothing provides usbguard needed by qubes-core-dom0-linux-4.1.17-1.fc32.x86_64
(try to add '--skip-broken' to skip uninstallable packages)
Fetching updates failed with code 1; press Enter to exit

Manually installing the usbguard rpm (along with its dependencies: libqb, protobuf) resolves this.