Messages via push notifications on iOS disappear in the RocketChat app forever

Description:

Messages received via push notification (iOS) are not shown in the app. They appear when users connect via the browser.

Steps to reproduce:

1. Receive a push notification on iOS
2. Tap on it
3. RocketChat opens and the message is not there
4. Restart RocketChat on iOS -> message still not there
5. Open a browser, login into RocketChat and the message is there

Expected behavior:

Messages should not disappear.

Actual behavior:

Messages disappear forever.

Server Setup Information:

• Version of Rocket.Chat Server: 7.5.1 (happened on 6.x too, we thought upgrading might help)
• License Type: community
• Number of Users: ~400
• Operating System: Debian
• Deployment Method: Docker
• Number of Running Instances: 1
• DB Replicaset Oplog:
• NodeJS Version: v22.13.1
• MongoDB Version: 6.0.13 / wiredTiger (oplog Enabled)

Client Setup Information

• Desktop App or Browser Version: App
• Operating System: iOS

Additional context

Relevant logs:

No source files or tests are named. Start by reproducing the push-notification flow in the iOS app and compare it with the browser behavior, then trace the server setup involving Node.js, MongoDB, and Docker. Done means the notified message remains visible in RocketChat after opening and restarting the iOS app.