system-monitor opens and closes second window

[phu9Suop]

Expected behaviour

on first click into applet mate system monitor opens an window and sets a lockfile or equivalent
on second click into applet mate system monitor checks existing lockfile, and then do not start an new window process, but makes already existing window go on top.

Actual behaviour

on second click into applet mate system monitor opens a new window and closes it again, sometimes immediately, sometime with considerable delay of up to one minute on my exhausted system, then window is visible, process can be observed in the lower tray

Steps to reproduce the behaviour

click into tray applet system monitor , hide opened window behind another one .
Make second click, see window sometimes appear, and not see existing system-monitor window go on top

MATE general version

MATE Desktop Environment 1.20.4

Package version

aptitude show mate-system-monitor
Paket: mate-system-monitor
Version: 1.20.2-1

Linux Distribution

debian 10.3

Link to downstream report of your Distribution

none.I think, this is soleley in the product.

[phu9Suop]

Had success

The two windows were permanent . A waste of resources.