Facebook Messenger chat heads disappear

[Android Central Question]

Greetings,

Recently updated to Oreo on a T-Mobile S8.

Upon opening a chat head (going to Messenger, long press on conversation, open chat head), everything works as intended.

If I close all open apps (including Messenger), lock the screen and then unlock, the chat head is no longer there. Oddly, I still have a notification that a chat head is active but I can't get it back unless I repeat opening Messenger and opening manually.

My wife also has the latest Oreo update from T-Mobile, but her chat heads are working as intended. I can repeat the steps above but the chat heads stay active and on the home screen.

Besides a factory reset, I've tried resetting all settings and permissions, re-installed Facebook and Messenger, "Apps that can appear on top" is on, background processes are set to the standard limit.

I don't get it. What can I do?

 

[missionsparta]

same is happening here. and every now and then they will finally open but it won't let me deal the chat head off the side of the screen so I can drag it to the x