Panning not possible after pinch zoom without lifting finger

[Plantain]

mapbox-gl-js version:
v45
browser:
Chrome Android

Steps to Trigger Behavior

1. Pinch zoom in and out, but leave fingers on screen
2. Lift one finger, try and pan with the finger still on the screen
3. Map does not move

Link to Demonstration

Will try and film this but believe the replication steps are easy to follow

Expected Behavior

Google Maps and most other touch slippy maps seem to detect one finger has been lifted and allow pans seamlessly after a pinch zoom.

Actual Behavior

Map remains fixed regardless of how the remaining finger is moved on the screen.