Here's a post I wrote recently that should explain what you're asking (different bulb, but the idea is the exact same), though you can also find more with a search:
A brief history of the "pre-staging" options: traditionally, a "Set Color" command will set a bulb to a specific color, while also turning the bulb on if its state at that moment is/was off. The "color pre-staging" option was added more recently to some drivers, allowing only the color information to be sent, while otherwise keeping the bulb in its current state (on or off). Not all devices or drivers support this.
So, as you may know, what this means is that if you have this option enabled, if…
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