GNOME Software Installed List Missing Apps

Installed Ubuntu Studio 20.04LTS 4 days ago. GNOME Software's installed list is missing a lot of programs that I have installed.
For example, I have installed Clementine but it is missing from the installed list. However, when I search for Clementine in Software it does identify it as being installed, but it (as well as a lot of other programs) are missing from the installed list in GNOME Software.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-software 3.36.0-0ubuntu3
ProcVersionSignature: Ubuntu 5.4.0-26.30-lowlatency 5.4.30
Uname: Linux 5.4.0-26-lowlatency x86_64
NonfreeKernelModules: talpa_vfshook talpa_pedconnector talpa_pedevice talpa_vcdevice talpa_core talpa_linux talpa_syscallhook nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: XFCE
Date: Tue Apr 28 20:14:43 2020
InstallationDate: Installed on 2020-04-24 (4 days ago)
InstallationMedia: Ubuntu-Studio 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
InstalledPlugins:
 gnome-software-plugin-flatpak 3.36.0-0ubuntu3
 gnome-software-plugin-snap 3.36.0-0ubuntu3
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-software
UpgradeStatus: No upgrade log present (probably fresh install)