[GNC] Error during update of GC (flatpak) under Ubuntu Studio 24.04.1 LTS

[rsbrux]

KDE Discover attempted today to update my GC installation from 5.9 -> 
5.10, but produced instead the following message:

Aborted due to failure (Error pulling from repo: While pulling 
runtime/org.gnome.Platform/x86_64/47 from remote flathub: Opening 
content object 
59fefe76b1fc9e02f320e2de582342a97a76dd640b0332c6832d8a36bb540ac7: 
Opening content object 
59fefe76b1fc9e02f320e2de582342a97a76dd640b0332c6832d8a36bb540ac7: 
Couldn't find file object 
'59fefe76b1fc9e02f320e2de582342a97a76dd640b0332c6832d8a36bb540ac7')

How should I proceed?