No way this isn't intentional (not a bug). Every single day, when I first put on my watch, I see the Daily Mix appear at the bottom. That would be fine, if it only appeared the first time I woke up my watch for the day, but it will only clear the notification, after I press it. If this is not the intended functionality, then when should it clear itself?
Honestly, it has led me to stop using Facer, because it was annoying me too much. I still have Facer installed, hoping that one day you would fix this. At least offer an option to turn it off.
I'm using a Gear S3