Some pinch gestures cause map to pan

[haphut]

Describe the bug
When pinching, the map often pans unexpectedly and sometimes at considerable speed. The user gets confused about why the map moved and what the viewport ends up showing.

To Reproduce
Steps to reproduce the behavior:

1. Go to the Interactive map example in the documentation: https://urbica.github.io/react-map-gl/#!/Components/MapGL/MapGL/3
2. Quickly pinch zoom and let go with one finger just slightly before the other. (Zoom in and out repeatedly if you do not succeed on the first try.)
3. The map pans.

Expected behavior
The map does not pan.

Mapbox GL does not exhibit the same behaviour: https://docs.mapbox.com/mapbox-gl-js/example/simple-map/

We could not reproduce it on visgl/react-map-gl either: https://visgl.github.io/react-map-gl/examples/locate-user

Smartphone (please complete the following information):

• Device: Google Pixel 3a, OnePlus 5T, Samsung A3
• OS: AOSP 10, OxygenOS 9.0.11, Samsung Experience 9.0 (Android 8.0.0)
• Browser: Fennec F-Droid (Firefox), Chrome, Chrome
• Version: 68.8.0, 83, 81