I’m using an app called “Dim with Me”. Below is the post with the app.
I tested with Smart Lights and things worked for me, however, Smart Lights only controls on and off, not dimming.
If I get a chance, I’ll load up trend setter and see if I can duplicate your the issues.
I haven’t messed with CoRE. That falls under my category of too much too read and install… (I told ya, i’m lazy)