[BUG] When entering a channel with unread threads, blue counter over the threads button disappears

[zdumitru]

Description:

When a user goes into a channel with unread threads, the blue counter over the Threads button disappears even though the user didn't yet read new thread replies.

Steps to reproduce:

1. Someone replies my message in a thread
2. I receive notification that there are unread messages in a channel
3. I go to that channel
4. I see the blue counter with number 1 on the Threads button
5. Counter disappears after one second even though I didn't read the reply.
6. Channel is marked as read

Expected behavior:

I expect the counter over the Threads button doesn't disappear until I open the actual thread (read the replies).

Actual behavior:

Server Setup Information:

• Version of Rocket.Chat Server: 1.1.3
• Operating System: Linux
• Deployment Method: snap
• Number of Running Instances: 1
• DB Replicaset Oplog:
• NodeJS Version: v8.11.4
• MongoDB Version: 3.4.20

Additional context

Relevant logs: