Channel Has Unread Message Indicator but Messages Don't Show Up Until Refresh

Description:

We are seeing an unread message indicator for a channel but no new messages in the channel. The messages will appear if we refresh the page or app. This started happening after we upgraded to v6.x.

Steps to reproduce:

1. Open app and wait for new message in channel
2. Look for message after channel unread indicator shows up
3. Refresh app to actually see message

Expected behavior:

Messages should show automatically without refresh.

Actual behavior:

Messages don't show until refreshing the app.

Server Setup Information:

• Version of Rocket.Chat Server: 6.1.5
• Operating System: CentOS 7
• Deployment Method: docker
• Number of Running Instances: 1
• DB Replicaset Oplog: Yes
• NodeJS Version: 14.21.2
• MongoDB Version: 5.0.15

Client Setup Information

• Desktop App or Browser Version: App 3.9.1 and Google Chrome 112.0.5615.121
• Operating System: Windows 10

Additional context

Relevant logs:

The report provides reproduction steps and environment details but names no files, tests, or entry points. Start by reproducing the missing-message behavior with the listed client and server versions, then trace the update path; done means new channel messages appear without an app refresh.