Color Coordinator to Smart Lighting Smart App

I tried to convert my last control from the color coordinator to the smart lighting smart app in preparation for the big transition. My current use case is coordinating color among three under cabinet lights. I moved this logic to the lighting smart app, with mirror behavior this week, and it appeared to work fine the first night. Since then, the other lights are not changing the color. I could use turn on and then set color, but then the color is limited to some fixed colors for all lights. I’m assuming this is a common use case. Does mirror not work and/or should I sue the turn on/set color, which will limit my control?