Through a process of trial and error - removing the following from
/var/lib/apt/extended_states

Package: gnome-software-plugin-snap
Architecture: amd64
Auto-Installed: 1

restored the functionality (note /var/lib/apt/extended_states had 5732 lines 
and it was narrowed down to this one)
FYI:
ii  python3-update-manager               1:20.04.10.1                          
all          python 3.x module for update-manager
ii  update-manager                       1:20.04.10.1                          
all          GNOME application that manages apt updates
ii  update-manager-core                  1:20.04.10.1                          
all          manage release upgrades

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https://bugs.launchpad.net/bugs/1766217

Title:
  software updater presents an empty panel for updating

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