I have used a when-clicked block for a certain object, so that when the object-1 is clicked, the opacity of object-2 will go from 0 to 100. I used another when-clicked block for object-3, so that when object-3 is clicked, the opacity of object-2 will return to 0. However, after this, when I click object-1 again, nothing happens. How do I get when-clicked blocks to work multiple times?