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After some time working with the system volume icon is no longer in the system tray and Fn-F11 / Fn-F12 do not work.
Restarting plasmashell does not fix the problem.
How do I restore it back without restarting the system or re-login? At least having some workaround would be nice.
It seems that the issue was that plasma-pa package was missing.
I guess it got uninstalled for some reason.
Reinstalling it and restarting plasmashell fixes the problem:
sudo apt-get install plasma-pa
killall plasmashell
plasmashell &