network-manager tray menu disappears when connecting to a wireless network

[William Poetra Yoga]

I'm using Linux Mint 18.3 on amd64 which is based on Ubuntu 16.04. I'm reporting this bug here because it is related to the network-manager tray icon, which I think is from nm-applet in the package network-manager-gnome, which on my laptop is version 1.2.6-0ubuntu0.16.04.4, which means that it is not modified from the Ubuntu version.

Package version: network-manager-gnome 1.2.6-0ubuntu0.16.04.4

What I expected to happen: The network-manager tray menu should update its contents when the machine connects to a wifi network.
What happened instead: The network-manager tray menu disappears when the machine connects to a wifi network.

Note: What I mean by the "network-manager tray menu" is the menu that appears when the network-manager tray icon is clicked, which shows wired and wireless connections, which connection(s) are active, and so on. Sorry if this is not the right name for that menu.

[William Poetra Yoga (williampoetra-7)]

This is what I mean by "network-manager tray menu".

[William Poetra Yoga (williampoetra-7)]

There are two general (but similar) ways to reproduce the bug:

A. Wake the laptop from suspend. There should be saved networks in range, and the "connect automatically" setting on for at least some of those networks.
- When the laptop wakes from suspend, immediately type your password on the lock screen, and as soon as the desktop appears, click the network-manager tray icon to display its menu.
- The menu will be displayed, and it will show the list of wireless networks, and also show the network that we are currently in the process of connecting. The tray icon is also the rotating wait icon at this time.
- But as soon as we successfully connect to the network, the tray menu disappears. This is the bug.

B. When the desktop is shown, connect to any wireless network.
- Click on the tray icon, the network-manager tray menu will appear.
- Click on any wireless network that is in range and that we have saved previously. The menu will disappear, this might be the intended behaviour. Also, the tray icon will flash into the network disconnected icon, and then change to the rotating wait icon.
- While we are still in the process of connecting to the wireless network, and the tray icon is still the rotating wait icon, click on the tray icon again to display the menu.
- The menu will display our chosen network in bold, although we have not successfully connected yet. This might be the intended behaviour.
- After a few seconds, at the moment that the connection is complete, and the tray icon changes to the wireless network connected icon (with the signal bars), the menu disappears. This is the bug.

Expected behaviour: The network-manager tray menu should not disappear when the connection is complete.