When trying to add a google account, after I enter my account credentials and authorize KDE to access my account, the result is an account with an empty email address field. Running systemsettings5 from the console, I see the following output just after the account is created:

Received session response                                                                      
Info:                                                                                          
        Id: 3                                                                                     
        caption: "google"                                                                         
        owner: ""                                                                                 
        userName: ""