Push Notification Background Task Crashes Emulator/Device

I have a universal app for Win 8.1 and WinPhone 8.1. I have a background task triggered by push notifications, which has worked fine in my Win 8.1 app. I made the necessary changes as far as registration goes for the Phone 8.1 app, and as far as I can tell
registration is fine. So I launch the app in the emulator, and send a raw notification using the 'Notification Simulator' tool. This does indeed trigger my background task JS file, but the emulator promptly crashes after displaying an error like "Network
communication is no longer available" or some such. This happens even if I put a break point on the first statement of the background task script. I've also tried using a real push notification from my web service and that produces the same results (emulator/device
crashing).
I made a small test in which I changed my trigger type to a system event so I could manually trigger the background task via VS. Doing this, I was able to properly debug the background task script. So something is definitely messed up with the push notification
trigger, but I have no idea what it could be. I've even copied my background task registration code to the 'RawNotifications Sample' app and that still works, so I know the registration code works. I've also copied the exact same code for the background task
script from the sample app since I know that should work.
The emulator crashing could be due to some errors I occasionally see in the background task, one of which is an 'Access denied' error when trying to access the
'WebUIBackgroundTaskInstance.current' property inside the background task. Another error occurred when trying to access
'ApplicationData.localSettings'. That one was something like 'failed to load state store'.
If anyone can make sense of any of this that'd be wonderful. I can post some screenshots of errors, etc. later today for added clarification.
Thanks.

So I've done some more investigating and it turns out the
sample app actually does not work as intended. When I thought it was working, I actually wasn't invoking the background task capability, but rather the
pushnotificationreceived event on the notification channel. After running the part of the app that is supposed to run the background task on receiving a push notification, I get the same crashing behavior as my own application. Based on this,
it would seem that Windows Phone 8.1 Developer Preview does not actually support background tasks triggered by push notifications.
Here are some screenshots of the emulator after I try pushing a raw notification via the NSE.

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