Same problem with me on a Huawei P20 Pro. All the permissions are activated. When receiving an sms the chat boubble for the message is displayed, and I can read and answer. The problem is when I'm closing the bubble, after that I cant find the sms inside the messenger app.
Was there ever a solution for this, I'm having the exact same problem.
Trying to use my Fitbit to check notifications at work but I can only send either messages (sms stock app) or FB Messenger witch allows both sms and its own notifications
Please help!!