In IOS 11, DeviceMotion in background stopped working

Question

My app reports and records location, altitude, rotation and accelerometer data (DeviceMotion) while in the background. This works fine on ios 10.3.3. On IOS 11, I no longer

Answer 1

The official 11.1 release fixed the issue and I've heard from iPhone 8 users that the original implementation is working for them.

The 11.2 beta has not broken anything.