SUMMARY
The Plasma notes widget doesn't work properly when put in the panel. More accurately, it doesn't show up when clicked on when no window is active - i.e. when I'm staring at the desktop or after writing stuff on the note or using any other panel widget.

STEPS TO REPRODUCE
1. Put the notes plasmoid on the bottom default panel (stock manjaro KDE panel)
2. Click on the notes plasmoid to launch it. Nothing happens.
3. Open a program like a web browser and focus on it with the mouse
4. Click on the notes plasmoid to launchg it. It shows up as expected.
5. Write something inside the plasmoid. Click somewhere on the panel tray to hide the notes
6. Click on the notes plasmoid to launch it.


OBSERVED RESULT
The notes plasmoid doesn't launch when no windows is focused on (when showing desktop or when using the panel).

EXPECTED RESULT
The notes plasmoid should show up at all times when clicked on

SOFTWARE/OS VERSIONS

Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.17.5
KDE Frameworks Version: 5.66.0
Qt Version: 5.14.0

ADDITIONAL INFORMATION
Manjaro up to date (05.02.2020)