Hi,
In order to have it show up there's a workaround right now which is executing JX.TypeaheadSource.prototype.setMaximumResultCount(100) to make phabricator show more results when autocompleting.
There's extensions for all browsers to run scripts per domain when a page loads, for example Tampermonkey for Chrome.
Hope this helps if anybody else has the same problem.
Cheers.