SUMMARY
When attempting to switch virtual desktops while the Application Dashboard is open, various strange behaviours occur. Firstly, the panel will appear over the dashboard briefly (for about as long as the desktop switching animation would take) and then nothing happens. If one repeatedly presses the shortcut for switching virtual desktops (e.g., Ctrl+Alt+LeftArrow) then a strange animation will play, as if Plasma is trying to switch virtual desktops but then is pulled back. Desktop is not switched.


STEPS TO REPRODUCE
1. Open Application Dashboard
2. Perform actions detailed above
3. Unexpected behaviours


OBSERVED RESULT
Panel appears over Application Dashboard briefly and then nothing happens. If the desktop switching shortcut is pressed repeatedly then a strange animation will play as if Plasma is trying to switch desktops, and then gets pulled back. Desktop is not switched.


EXPECTED RESULT
I'm honestly not sure what expected/intended behaviour would be. I tested switching desktops with Application Dashboard, Application Launcher, and Application Menu under both X11 and Wayland. Here are their behaviours:

X11
- Application Dashboard: Strange behaviour mentioned in this report.
- Application Launcher: Stays open across virtual desktops.
- Application Menu: Stays open across virtual desktops.

Wayland:
- Application Dashboard: Stays open on the virtual desktop it was opened on, and allows for switching virtual desktops. The other virtual desktops do NOT have the Application Dashboard, however it will stay open when switching back to the desktop it was opened on.
- Application Launcher: Closes when switching virtual desktops.
- Application Menu: Closes when switching virtual desktops.

In my own PERSONAL opinion, the behaviour that makes the most sense would be that the Application Dashboard, Application Launcher and Application Menu allow for switching virtual desktops AND stay open across all virtual desktops - Essentially the behaviour of the Application Launcher and Application Menu on X11 (meaning as a result, the behaviour of these two on Wayland is incorrect).  ​


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.14.15-arch1-1 (64bit)
KDE Plasma Version: 5.23.2
KDE Frameworks Version: 5.87.0
Qt Version: 5.15.2