Not sure I completely follow this suggestion, but if you begin dragging from a region outside the scroll view, the modal gesture does work. However, I don't think this is a good solution: drags within the scrollview itself should work as it has in iOS 13/14. In my situation, the nested collection view takes the full screen height.
jordansmithnz
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Thanks, makes sense. Scrolling beyond the bottom behaves as usual (the modal drag down wouldn't usually trigger in this scenario).