You can type in an issue key on fields such as comment, description, etc., and have Jira create a direct link to that issue.
Currently, if you paste a key into a field and simply save the content, the smart link is not created.
- Copy an issue key
- Paste it into the field Description or Comment.
The smart link will be created.
The smart link is not created. When you see the issue in the old view, you can see that smart link.
Here's a recording: Paste key on the new view.mp4
You need to press space or enter right after the key to turn it into a smart link. (That might require some good manual work when there are several issue keys inside of a big text that you pasted though).