Description:

After updating to 2.1.0 the read receipts are not displayed anymore. No checkmark in browser, and only grey checkmarks in the app. No blue checkmarks after a message is read.

Also when showing message info, only the person who send the message is shown in the list.

Steps to reproduce:

1. Direct chat or group chat
2. open message context menu, select info
3. only the person who wrote the message is shown, no one else, even if the message has been read

Expected behavior:

• message read receipt shown in info
• blue checkmark in direct chat

Actual behavior:

• In group chats: only the person who wrote the message is shown, no one else, even if the message has been read
• in direct chats no blue checkmark appears

Server Setup Information:

• Version of Rocket.Chat Server: 2.1.0
• Operating System: 4.19.72-gentoo, Ubuntu 18.04 LTE (tested on two systems)
• Deployment Method: Docker
• Number of Running Instances: 1
• DB Replicaset Oplog: Enabled
• NodeJS Version: v8.15.1
• MongoDB Version: 4.2.0

Additional context

• could be related to changes in [IMPROVE] Add missing indices used by read receipts #15316
• could be a problem on our end because using MongoDB 4.2.0

Relevant logs:

Server log when accessing "info":

Meteor ➔ method getReadReceipts -> userId: RQySce2mbjTpGyxGt , arguments:  [ { messageId: '4cce12f2-60f4-443f-b253-46043a799eae' } ]
Meteor ➔ method canAccessRoom -> userId: RQySce2mbjTpGyxGt , arguments:  [ 'THG8ez3NKvCi9WoYv', 'RQySce2mbjTpGyxGt' ]