Natural Scrolling setting does not work

[Tim Wood]

Go to Settings > Mouse & Trackpad
* Turn off Natural Scrolling and Click "Test Your Settings"
* Moving scroll wheel "up" moves content down
* Turn on Natural Scrolling and Click "Test Your Settings"
* Scroll wheel behavior is unchanged

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xfce4-settings 4.14.3-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-52.57-generic 5.4.65
Uname: Linux 5.4.0-52-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.10
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: XFCE
Date: Sat Oct 31 13:30:15 2020
ExecutablePath: /usr/bin/xfsettingsd
InstallationDate: Installed on 2020-05-12 (171 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
ProcEnviron:
 PATH=(custom, user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 LD_PRELOAD=<set>
 SHELL=/bin/bash
SourcePackage: xfce4-settings
UpgradeStatus: No upgrade log present (probably fresh install)