Software & Updates - Authentication Tab - Restore Defaults - no Trusted Software Providers loaded

Enabled livepatch on two cleanly installed laptops - entered settings GUI for livepatch by right-clicking on status icon and selecting 'Livepatch Settings...' - navigate to the 'Authentication' tab - click on the 'Restore Defaults' button - on one laptop, keys are loaded from the /etc/apt/ and /etc/apt/trusted.gpg.d folders - on the other, however, nothing happens / no keys are loaded even though the exact same keys are on both machines. I can't determine why these systems behave differently as they were both installed using the exact same USB media using the exact same setup process.

Both laptops are configured with:
Ubuntu 22.04.1 LTS
Livepatch 10.4.1
Gnome Version 42.5

What I expected to happen: Authentication tab's Trusted Software Providers area gets populated with default keys - i.e., Trusted Software Providers' keys are displayed

What happened instead: nothing; Authentication tab's Trusted Software Providers area remains blank - i.e., No keys are displayed in the Trusted Software Providers area

I don't know if this presents a security vulnerability or not; I guess it depends on whether or not livepatch would retrieve / install packages from untrusted sources? I would expect not, but I'm not certain if that's true.