currently in the "Element visibility" trigger (and possibly others), the DOM is re-scanned (only?) when a "Scroll" is detected. But sometimes, a new Element might become visible, yet the user is not scrolling (for example when the user clicks on a button and a new DOM element appears). The Element visibility trigger wouldn't be triggered in this case (until the user scrolls).

In terms of solutions, I have no idea really.... but some thoughts anyway:
maybe there could be some possible improvements (ie. detect element visibility on "Click" as well as "Scroll" and maybe other events also).