Some swipes should be enabled only from borders
Whith the "over" transition, swiping forward can be performed by visually not pulling the next child, but the empty space above the current one. Similarly with the "under" transition and swiping back.
I suggest that we should always drag visually visible parts, and when not possible then allow dragging from n pixels from the border. 32px maybe, or 50px, it should be tested.
It could also help solving horizontal swiping conflicts like here, by dedicating the border to the leaflet gesture and the rest for horizontal scrolling: