[Regression] React doesn't work on 0.66.0-rc3 when message already have any reaction

[rafaelks]

Description:

We're using the REST API to react to any message from a long time now in both iOS and Android. For this release, the API stopped working (testing in open.rocket.chat).

Here's the request we do:

:method: POST
:scheme: https
:path: /api/v1/chat.react
:authority: open.rocket.chat
accept: */*
content-type: application/json
x-auth-token: (private)
accept-language: en-BR
content-length: 65
user-agent: RC Mobile; iOS 11.4; v3.0.0 (183)
x-user-id: (private)
accept-encoding: br, gzip, deflate

{
  "emoji" : ":thumbsup:",
  "messageId" : "3Xu26KJEjxtynjiA6"
}

:status: 200
access-control-allow-origin: *
cache-control: no-store
content-encoding: gzip
content-type: application/json
date: Wed, 27 Jun 2018 18:50:32 GMT
pragma: no-cache
vary: Accept-Encoding
x-instance-id: jabdw7SCzfMdBWtT5
content-length: 36

{"success":true}

Here's the message coming from the WebSocket (without the reaction):

{
  "emoji" : null,
  "_updatedAt" : {
    "$date" : 1530120292369
  },
  "editedAt" : null,
  "editedBy" : null,
  "reactions" : {
    ":no_mouth:" : {
      "usernames" : [
        "rafael.kellermann"
      ]
    }
  },
  "u" : {
    "name" : "Rafael Kellermann Streit",
    "username" : "rafael.kellermann",
    "_id" : "(private)"
  },
  "mentions" : [],
  "alias" : null,
  "ts" : {
    "$date" : 1530120286443
  },
  "attachments" : null,
  "_id" : "3Xu26KJEjxtynjiA6",
  "rid" : "tn3EiAYecbtXGEBDn",
  "channels" : [],
  "avatar" : null,
  "customFields" : null,
  "msg" : "..."
}

[rafaelks]

Updating... happens on the web client too.