Ran into this issue a few months ago. One of my developers is having the same issue, and it occurred to me that this probably isn’t intended behavior, so I should probably file a bug report…
When a TextButton is in a scrolling frame, and has the same Z Index as the scrolling frame, clicking the button doesn’t trigger the :Activated() event as expected, even though the button is visible.
Expected behavior
Expected behavior is that a TextButton inside a scrolling frame, which has the same Z Index as the scrolling frame, should be “tappable” - as it is visible.