It looks like you can avoid the disconnect when backgrounding with:
* Press and hold on the app icon.
* Tap 'App Info'
* Tap 'App battery usage'
* Make sure 'Allow background usage' is enabled (pretty sure it is by default).
* Tap on 'Allow background usage' to the left of the slider.
* Set to 'Unrestricted'.
This looks like it restores the previous behavior.
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