PickSingleFileAndContinue back button bug?

I think I may have found a bug in the Silverlight 8.1 file picker abomination. After much pain rewriting my original image picker and eventually getting it to work for 8.1 (minus random yet frequent crashes from low level system
code), I thought I'd add a file picker for audio files to my app. I used the same logic and all is fine if the user actually picks a file. Where things fall apart and behave differently is when being presented with the "choose an app"
screen containing OneDrive or Phone as choices and pressing the back button instead of selecting an app. The back button falls straight through my page's OnBackPressed override (i.e. never called) and takes me back an extra page. I don't get
this behaviour for images as I'm taken straight to the image library and my app is suspended.
That initial screen pop up must be happening in-process as it doesn't looked to have pushed my app to the background yet. Using the back button should take me back to the page that called the PickSingleFileAndContinue or resume the app as though the system
had pushed it to the background. At the moment it seems to be sending an unhandleable (great English!) back button request. Can I change this behaviour or am I missing something obvious?

The back button falls straight through my page's OnBackPressed override (i.e. never called) and takes me back an extra page.
Do you get a ContractActivated event?
https://msdn.microsoft.com/library/windows/apps/dn642086(v=vs.105).aspx

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