snap/snappy packages opened via mate-menu leaves defunct process when quit

[walterav1984]

When snap packages like "vlc & shotcut" get started/opened via the "mate-menu" no matter if its a "standard" or "--classic" confined snapd packages they both leave "defunct process" when quit/closed after usage on ubuntu-mate 18.04 and 19.04 amd64.

Reproduce:
Tested both "shotcut" and "vlc" open a terminal:

sudo snap install vlc
sudo snap install shotcut --classic

Now open/run "vlc" and or "shotcut" via the "mate-menu" shortcuts and quit both applications after opening and open a terminal again to check defunct processes and notice its parent:

ps -ef | grep defunct
userx      2219  2494 10 11:50 ?        00:00:03 [vlc] <defunct>

ps -e | grep 2494
2494 ?        00:00:02 mate-menu

killall mate-menu #click the reload option

#check again if vlc defunct process is killed and notice its gone
ps -ef | grep vlc

See shotcut example