Reset the taskbar of KDE to default settings, this is how it works.
Quickly it happened, something pushed back and forth, then a part was gone. Later, I still had an analog clock in the taskbar.
Fortunately, the whole thing can be quickly reset to the default settings. To do this, we open a console and run the following three commands.
rm ~/.config/plasma-org.kde.plasma.desktop-appletsrc rm ~/.config/plasmashellrc rm ~/.config/plasmarc
The last one may cause an error, just ignore it. Afterwards, log out and log in again. The taskbar is now back with default settings at the bottom.
OMG thank you SO MUCH! This was driving me crazy for the last God knows how long!!
You forgot to add Reboot the system.