This is a Beta preview of the next major feature release, called Cycle 8. It has several known issues under investigation, but as mentioned in the Release Blog post, the Xamarin engineering team is looking for as much additional user feedback via Bugzilla as possible on these Cycle 8 Beta versions, especially for the iOS 10 and Xcode 8 features.
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Not sure if it's Xamarin Forms or Xamarin.iOS related, or both.
Xamarin encourages to report iOS 10 issues as iOS 10 launch is approaching:
http://forums.xamarin.com/discussion/73602/beta-release-cycle-8-feature-release-preview/p1
As boring it might sound @deandean you should file a bug report:
https://bugzilla.xamarin.com/newbug?release=C8Preview
@deandean it looks like it's a known issue currently worked on:
http://forums.xamarin.com/discussion/comment/219811/#Comment_219811
@AndrewMobile thank you, hope they will fix it quickly.