Broken channel join on mention

> Hey, potential bug found with messages/chat. Friend made a new channel, posted something and i got the notification, i even saw the chat message appear but it disappeared quickly. And I can't see any messages. I also see the notification badge (orange circle with a number)...
>
> 1. Team member created a channel
> 2. Only he had access to the channel (the channel itself was public and we are both "owners", with auto join turned off)
> 3. Team member wrote a post and tagged me in it, which added me to the channel automatically
> 4. All posts inside this channel were disappearing for me or they would just not show up.
>
> Possible fix : Removing and then adding the user again seems to have solved the problem.

_{Huly®: UBERF-8089}