Closing this as designed.

We are aware of this design flaw that is specially present with the combination of the ToggleGroup component's state and the Selectable's state. As is, current they do not share the same states which is why they doesn't drive one another. Unfortunately, updating this behavior would cause a lot of regressions on existing projects. While it's not the desired response you may be expecting, a workaround would be a good way to achieve your desired outcome. One example would be to create a function that finds the active item from the ToggleGroup and assign the active item's target graphic color to the toggle's selected color and reset back to normal those that aren't.