'@' Mention tagging and other Wiki style rendering no longer working. Appears to be in both standard JIRA projects as well as Service Desk projects.
Confirmed that Browse Users permissions, Wiki Style Rendering of comments and description fields and Email Visibility of users is correct as per: https://confluence.atlassian.com/jirakb/mentions-and-autocomplete-are-not-working-in-jira-cloud-779160727.html
Please note, we are using JIRA Cloud.
Dialog box with user info does come up and allow you to select user, converted into bracket/tilde format as expected and preview shows correct '@'user info (and correct wiki rendering of smileys, etc) however when you save it, it converts back to non-wiki rendering. Notification is sent, however (so user is emailed).
Thanks!
Rick