For our articles we use an overlay to simulate a background image with "background-attachment: fixed" css property on mobile devices. This overlay has "pointer-events" set to none, so it should not interact with touch events.
However the scrolling hardly works on the Android DPS app. It only scrolls in small steps. It works correctly when loading the article in Chrome (Android).
There is also no issue on the IOS version of the DPS app.
Here's an example article reproducing the problem:
Thanks for sharing such a nice, clean, HTML file that reproduces the issue. I was able to make the issue happen on my device as well. I've logged a bug against the Android viewer to investigate what's going on.