Problem with old notifications being sent after enabling mobile push notifications

Description

Hi, we recently tried to enable the push notifications via rockectchat gateway https://gateway.rocket.chat.
We have chosen the privacy setting not to include the message content in notifications.

After enabling the notifications the users that previously allowed mobile app to receive push - have received tons of OLD notifications including content of old messages.

Is this a bug? How can we start clean and only allow new messages to be sent after enabling push?
Is there some kind of notification queue that gets released after the feature is enabled. Can we clear this?

Server Setup Information

  • Version of Rocket.Chat Server: 1.1.1
  • Operating System: Ubuntu 16.04
  • Deployment Method: docker
  • Number of Running Instances: 5
  • MongoDB Version: 3.2
  • Proxy: nginx

Any additional Information