SUMMARY
Whenever I create notes in Kontact, they do not appear on the screen. When I create notes via KNotes standalone application, it will disappear as soon as I close KNotes standalone application (probably intended behaviour). When I open Kontact afterwards, behaviour depends on whether KNotes standalone is still running or not.
If it's still running, clicking on the notes tab in Kontact creates a new note on desktop, but the notes cannot be viewed from within Kontact. Instead, Kontact states, that it tries to bring KNotes standalone application to the foreground (which it doesn't do, it just opens a new note in the background). Clicking repeatedly on the notes tab does nothing, unless you switch to another Kontact tab in between. In that case, it produces a new note every time I try to switch back to the notes tab.
If KNotes isn't still running, opening Kontact shows the available notes when switching to the notes tab as intended, but the notes do not show on my desktop at all, and I do not see any way to bring them to my desktop. Creating notes in Kontact/notes does not bring the notes to the desktop either.

STEPS TO REPRODUCE
Pls see my description above, too complicated.

OBSERVED RESULT


EXPECTED RESULT


SOFTWARE/OS VERSIONS
Windows: 
MacOS: 
Linux/KDE Plasma: openSUSE Tumbleweed 20190126, Kernel 4.20.2-1 default, 64 bit
(available in About System)
KDE Plasma Version: 5.14.5
KDE Frameworks Version: 5.54.0
Qt Version: 5.12.0

ADDITIONAL INFORMATION