Invitation Application does not display correctly the invitations sent to multiple email addresses

Preconditions: Invitation Application must be configured (Administer Wiki > Users & Rights > Invitation Application > SMTP Settings):

SMTP Username: yourusername@gmail.com
SMTP Password: yourpassword
SMTP Server host name: smtp.gmail.com
SMTP Port: 587

JavaMail extra properties:

mail.smtp.starttls.enable=true
mail.smtp.localhost=my.server.hostname.com

STEPS TO REPRODUCE

1. Go to Administer Wiki > Users & Rights > Invitation Application
2. Tick the Check Box for "Let users send to multiple addresses" and click Save
3. Go to Invitation Application and send an invitation to multiple addresses (e.g. to 3 different addresses, the separator is ", ")
4. Go to My Invitations (from Tools Section)

EXPECTED RESULTS

Under My Invitations section, there should be displayed all the invitations sent to each email address, which the user has the option to rescind.

ACTUAL RESULTS

If an invitation is sent to multiple email addresses at once, is displayed only the one sent to the first email address. The user has no possibility to see and/or rescind the invitations sent to other email addresses.

Nevertheless, all the invitation emails are sent to the respective users.