Summary

In certain situations it's possible for at mentions to return users from the REST endpoint, however the JavaScript does not present them as available users in the browser. As a result of this no users can appear as mentionable.

Steps to Reproduce

1. Setup users in a vanilla instance as follows:

       "name": "xcmvnx,mcnv",
       "emailAddress": "potato@example.com",
       "name": "asdkalkj",
       "emailAddress": "potato@example.com",
       "name": "a-train",
       "emailAddress": "potato@example.com",
       "name": "black noir",
       "emailAddress": "potato@example.com",
       "name": "gvbbvn",
       "emailAddress": "pxrzzkkcl@localdomain",
       "name": "hughie campbell",
       "emailAddress": "potato@example.com",
       "name": "jack from jupiter",
       "emailAddress": "potato@example.com",
       "name": "mister marathon",
       "emailAddress": "potato@example.com",
       "name": "queen maeve",
       "emailAddress": "potato@example.com",
       "name": "starlight",
       "emailAddress": "potato@example.com",
   

2. Try to at mention them using @p.

Expected Results

The users appear in the browser.

Actual Results

The REST endpoint returns these users, however they do not appear. As a result of this it looks like no users are returned.

Workaround

Given there is a max of 10 users returned, extending the search results using @pe or similar may return the actual users. If not, attempt to mention the user by changing the search results back-and-forth, for example if you wanted to mention a 'Joey':

1. Use @j
2. Then @p
3. Then @jo

Alternatively mentioning them by their name instead of email address will work, for example @mister marathon.