Two-finger touchpad scroll broken

Run Calc -> drag two fingers up, down, left or right slowly.

Expected behaviour: content pans in the direction of movement

Observed behaviour: no effect on viewport, sometimes at all, sometimes after a sufficiently long drag, the viewport jumps/snaps to a different part of the document, as if the entire "accumulated" movement happened at once

The behaviour is easily reproducible in Calc and Draw, but does not happen in Writer. Other applications (e.g. Firefox, Nautilus, GVim...) work as expected, scrolling smoothly as fingers slide along the touchpad.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: libreoffice-core 1:6.0.7-0ubuntu0.18.04.10
ProcVersionSignature: Ubuntu 5.3.0-51.44~18.04.2-generic 5.3.18
Uname: Linux 5.3.0-51-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.15
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Wed Jul 22 14:31:59 2020
DistributionChannelDescriptor:
 # This is a distribution channel descriptor
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-xenial-amd64-20160624-2
InstallationDate: Installed on 2018-05-10 (804 days ago)
InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 20160624-10:47
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: libreoffice
UpgradeStatus: Upgraded to bionic on 2020-03-04 (140 days ago)