Pinch to zoom not working on Android/Chrome

When you load a flickity image fullscreen using this module, on Android/Chrome, pinch-to-zoom is not working. It works fine on iOS, however. It also works on Android in the Samsung Internet Browser app. I am able to reproduce this using the [fullscreen demo here](https://flickity.metafizzy.co/options.html#fullscreen).

Is this a known issue, or should I keep digging further?

Start by reproducing the issue in the linked fullscreen demo on Android/Chrome and compare its touch behavior with iOS and Samsung Internet. Trace the fullscreen module's touch and zoom handling, then verify that pinch-to-zoom works on Android/Chrome without regressing the browsers where it already works.

Written by the indexing model from the issue text.