Since Plasma 5.22 unattended updates appear to be broken as per summary description.
STEPS TO REPRODUCE
1. Wait for updates to be downloaded
2. Allow Discover to reboot machine
3. Machine reboots but no update occurs
No update at reboot time
Updates applied at reboot
Operating System: KDE neon 5.22
KDE Plasma Version: 5.22.0
KDE Frameworks Version: 5.83.0
Qt Version: 5.15.3
Kernel Version: 5.4.0-74-generic (64-bit)
Graphics Platform: Wayland
Processors: 4 × Intel® Core™ i5-6200U CPU @ 2.30GHz
Memory: 7.1 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 520
Also seen this. Not every time, but enough to confuse.
After you reboot and log back in, you get a "pop up" with the same number of patches needing to be applied. If you run Discover again and update all, you get the "restart" prompt straight away and then the patches are applied.
Created attachment 139371 [details]
Discover notifying about non-existent updates
(In reply to Antanicus from comment #3)
> Created attachment 139371 [details]
> Discover notifying about non-existent updates
Updates were correctly applied this morning (ie. at reboot time) but after logging in I was notified about new updates, but there seems to be nothing to update.
*** This bug has been marked as a duplicate of bug 438670 ***
*** This bug has been marked as a duplicate of bug 438809 ***