Export to Word or Printable won't print Request participants values

We have recently updated to JIRA 6.4 and JIRA Service Desk 2.5

JIRA Service Desk introduces Request participants field JSD-269 which is displayed correctly in issue view screen, however when the issue is exported as printable or word, request participants always is empty

Steps to reproduce

Create an Issue
Hover Request Participants and add one or more users and click the tick button
Click export
Choose either printable or word

Expected

All values including Request participants will be included in exported document

Actual
Request participants contains no value