I have been hibernating this system for ages but I updated it this morning and after a reboot the hibernate option has gone from the KDE menu, it was there before the update because I used it to hibernate this PC yesterday. As normal I did a zypper dup to update this TW/KDE system.
Any suggestions as to how to get the menu item back?
I have Tumbleweed in a VM, and neither hibernate nor sleep has ever been in the menu. I have been unable to work out why. And both are there for Tumbleweed in another VM and for Tumbleweed on real hardware.
Have you tried creating a new user, to see if it is in the menu for that new user?
Created a new user and hibernate was there. Prior to doing this I did remove hibernate as a favourite from plasma-org.kde.plasma.desktop-appletsrc from the user where it had disappeared but that was all. Now when I logged back in as this original user hibernate was back in the menu again and was able to re-add to favourites.