This is a bug in kdelibs as noted in KDE upstream bug 130709 but upstream KDE doesn't appear to actually want to fix the bug. They want every app that "talk to a running instance" to have a helper script for kde use to sleep long enough for the app to open the file before kdelibs deletes it from under it.
This is a bug in kdelibs as noted in KDE upstream bug 130709 but upstream KDE doesn't appear to actually want to fix the bug. They want every app that "talk to a running instance" to have a helper script for kde use to sleep long enough for the app to open the file before kdelibs deletes it from under it.