Yes - the page swipe and "item" swipe gestures are controlled by Ionic. I was discussing this with them a few days ago, and we agreed Ionic could probably do better to match the swipe behavior of native iOS apps (e.g. Mail). It works, it just needs to be tweaked to prefer page swipe over item swipe in certain situations.

Voyager specifically makes heavy use of page swipe + item swipe, and there's almost always a swipe-able item where you're swiping to go back, which just magnifies this issue that would probably not be noticeable for most apps out there.