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...
mattlee
Microsoft Employee
Microsoft EmployeeThank you for the updates - the most likely issue at this point is that you are using a custom theme, and are using action state selectors ($id: "selected" etc.) in your theme file for this new visual. Are you all using custom theme files with State formatting in them for button slicer?