I found this in my Journal kf5.kded: found kded module "touchpad" by prepending 'kded_' to the library path, please fix your metadata.
kded_touchpad.so is installed by plasma.
it looks like this was fixed here: https://cgit.kde.org/plasma-desktop.git/commit/?id=b10fe56678cf20688c90f15ca76c6917d830c7b5
resolved then?