UPDATE: Issue fixed with new json theme. However, mattlee there is a problem with the button fill. The fill doesn't actually fill the whole of the last button and is a visual glitch. See the screensh...
I can confirm I'm using a custom theme with action state selectors. Is the fix to not use a theme or do you plan to make this work with a theme? As an aside, I notice not all properties in my theme work on the new custom visuals.