I have a custom text field (>255) chars. I have verified that the all users browse is configured, the wiki renderer is turned on (in fact I have tested making sure I can do some wiki), the users have browse, etc. The @mention for the comments and description field for the same issue for the same user work fine.
This is actually the current behavior. We are tracking a suggestion to allow users to use mentions within custom fields as well on https://jira.atlassian.com/browse/JRA-32563.
I'd advise you to vote on this suggestion to increase its popularity and add yourself as a watcher to receive any further updates regarding it, but at this time unfortunately I don't think there's any way to do this.
Teams break work down in order to help simplify complex tasks. This is often done iteratively, with tasks being broken down into smaller tasks and so on until the work is accurately captured in well-...
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