In the API Configuration it's possible to change the properties normally. But in the case of system roles
you can't add non-default properties. They won't show up in the main data tab of the system role. You can only add/remove the hard coded properties.
This issue with "Property editors / Properties that can be edited" not working for "System roles" is also happening with "Business roles". I then tried out "Resources" but here the functionality works, strange?
In the API Configuration it's possible to change the properties normally. But in the case of system roles you can't add non-default properties. They won't show up in the main data tab of the system role. You can only add/remove the hard coded properties.