This is a duplicate of https://bugs.chromium.org/p/chromium/issues/detail?id=657104, but it's not clear who's at fault: Chromium or Xwayland. The issue is that in a Wayland session, Chromium/Chrome runs with Xwayland and has inappropriate touchpad smooth scroll behavior: it scrolls in discrete lines as if with a scroll wheel, rather than one pixel at a time following your finger.
This is being tracked in Chromium, and it's certainly their issue: https://bugs.chromium.org/p/chromium/issues/detail?id=712737
Thanks!
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.