Cannot open window when process is already running

[funder7]

Hello,
I'm running WhatsDesk on a Ubuntu based distro (bionic). In fact I'm using ElementaryOS 5 which uses Gala as its Window Manager.

WhatsDesk has been installed through Snap.

Issue description

It happens somehow that WhatsDesk is running and I've the icon pinned in the dock, so I use that icon to switch to the app, or CMD+TAB combination, as you do usually with all the apps.

Sometimes it stops to work I suppose... It doesn't show any error, that's why I don't know exactly what happens, and when.
What can I say for sure, is that the Window Manager doesn't see the app running anymore. At least the App window is not, but the other processes are, as you can see in this screenshot:

Workaround

In order to start WhatsDesk again, I have to kill those background process manually, then I can start the app again from the dock.
If I don't kill the processes, then clicking the dock icon does nothing, the app will not start.

I would be happy to provide more debugging informations, if someone can tell me how to get them.
Launching the app from console it's sufficient or it needs some other arguments ?

Edit

Just look at how many processes are running...they all belong to the top one, but WhatsDesk is still not running (I mean the visible Window).

Have a nice day ;-)