Reporter/Customer doesn't receive any notification when ticket is created on his/her behalf (JIRA + JSD)

Steps to Reproduce:

1. Have a JIRA + JSD project running
2. Turn JSD notification on
3. Raise a ticket on customer's behalf (set customer as the reporter)
   1. Comment on this issue
   2. Change issue's status

Expected Results:

1. Reporter/Customer should be notified when a comment is added on the issue (3.1)
2. Reporter/Customer should be notified when there is a change in the request's status (3.2)

Actual Results:

1. No notification is sent to Reporter/Customer regarding the issue.

Workaround:
Disable JIRA Service Desk notification (Cog Icon > Add-ons > JIRA Service Desk Configuration), this way, JIRA notification scheme will work as defined for all events and users.

Notes:
The notifications aren't working for Request Participants as well.

Documentation of JSD Notifications: https://confluence.atlassian.com/display/Cloud/Configuring+JIRA+Service+Desk+notifications