UserLister Macro Does Not Work As Expected

The User List macro (also known as UserLister macro) documented in this article does not work as expected on Confluence 5.9.x and later versions. It works perfectly fine on versions prior to Confluence 5.9 series.

Expected Behavior

The User List macro returns a list of online users based on the preset group(s) if the "Display Online/Offline Users" parameter is flagged as "true". The list includes the user account you are logged into.

Actual Behavior

The list does not return any users along with the message "No results were found for groups : confluence-administrators,confluence-users". In other words, all users fell under "offline" status regardless of the users' activity.