Missing XSRF token when click on "authorise" from workbox

How to Replicate

• Install Confluence 5.9.x
• Install Jira 6.4.x
• Link the applications (default is OAuth, but we did try Trusted apps with the same results)
• @mention a user that is in both Jira and Confluence on a Jira issue
• Click on the workbox notification in Confluence
• Authorize and allow the connection

At this point you will be returned to Confluence, and the workbox, with the same authorization prompt

2016-05-12 16:37:56,075 WARN [http-nio-8080-exec-10] [common.security.jersey.XsrfResourceFilter] passesAllXsrfChecks XSRF checks failed for request: http://localhost:8080/confluence/rest/mywork/1/client/pong , origin: null , referrer: null
 -- url: /confluence/rest/mywork/1/client/pong | userName: admin