kdesyscoca during DNF dumps all over konsole window

[Jerome Yuzyk]

[kf5 5.54, plasma-workspace 5.13, Fedora 28]

Whenever I run Fedora's DNF package manager, often kdesycoca is triggered, and 
it dumps stdout/stderr over whatever tab is displayed on the last-opened 
Konsole window. The dump is dark-grey on light-grey and is overlaid like a 
'wall' message - it can't be copied, and doesn't always clear with a page-up/
down in vim, which is usually what it dumps on.

Anyone ever seen this?