This happens while connecting to a VPN server using openconnect, The server has several groups. A combo shows the different groups as options for the login form, and the first one is shown as selected in the combo.  If I try to change it, the combo reverts to the first, not keeping my selection. If I change the form:main:group_list key in the NetworkManager config file, it does not show the login form. Clicking the connect button immediately tries to connect, which fails showing the message "Connection attempt was unsuccessful" (presumably because of a group/username/password mismatch). 
Connection with command-line openconnect proceeds successfully for the "group".

Reproducible: Always

Steps to Reproduce:
1. Trigger the VPN connection
2. Select a group that is not the first
or 
2. Have the group changed in the config file and attempt the connection


Actual Results:  
In the first case, the group is not changed in the combo. When clicking any other combo entry, the item shown is always the first.

If the group is set in the config file, the login form is not shown. If the connection is attempted,  no password can be entered and the attempt fails with the message  "Connection attempt was unsuccessful".

Expected Results:  
In the first case, expect to see the combo entry changed, and be able to login afterwards.

In the second, expect the login form to be shown with the selected entry and the connection to succeed after the login and password information has been entered 

Previous version 5.4.3 worked fine