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I'm seeing a weird interaction between UIPageViewController and dragging. When a drag hovers over a UIPageViewController set up to scroll horizontally, it'll randomly scroll a full page's worth leftwards, into blank space. Dragging the page-controller view slightly restores it to where it should be.I can replicate this in a trivially simple project, but I can't find a good workaround. It feels like something in the internals is spring-loaded that shouldn't be, but I'm not sure how to squish this behaviour.My app is build around a UIPageController as the main container vc and makes heavy use of drag and drop, and this behaviour is not just an occasionaly glitch, but an absolute killer.Anyone got any ideas what I can poke at?Edit: rdar://34926095