It is not possible to insert shortcut links in the new editing experience. The documentation states that this functionality can be used via the advanced insert link dialogue but that is no longer present in the new editing experience.
- Configure a shortcut link definition via https://<host>.atlassian.net/wiki/admin/browseshortcuts.action
- Create or edit a page using the new editing experience
- Insert a link using the shortcut link syntax link@key (ex. atlassian@google)
Link is created using the expanded value of the specified key
A broken link to [http://#|http:/#] is created
Currently there is no known workaround for this behavior. A workaround will be added here when available