I use SmarttThings at home for automation. Part of that is using the app as a presence sensor for changing modes from Home to Away and vice-versa.
Since I got my OP6, I’ve not been able to keep ST running in the background. Any push notifications that come from SmartThings do not come up unless I very recently launched the app.
I have a perimiter set about ~3 minutes away by car, and even so, I can sit in my driveway waiting for the system to disarm, before manually opening ST and then it updates my location and things happen immediately.
I disabled battery optimization for both apps but still got the problem.
My girlfriend is using the app on the iphone x (IOS) but didn’t have the problem.