Software 3.35.2 vs Synaptic shows different upgrades

[Alistair]

Hi Ive always used Synaptic, and due to Software unable to reliably search.
Search is another bug in Software - not always reliably shows contents of repos.

I use Synaptic more often than Software, and notice that when I do a ‘mark all upgrades’ in Synaptic, it shows lots of updates, whereas Software is showing its up-to-date. Both package managers have identical repositories and settings. Before Mark All Upgrades I do: reload package info, unmark all.
Perhaps this is related to the faulty search function in Software?

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-software 3.35.2-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-9.12-generic 5.4.3
Uname: Linux 5.4.0-9-generic x86_64
ApportVersion: 2.20.11-0ubuntu16
Architecture: amd64
CurrentDesktop: Budgie:GNOME
Date: Wed Feb 5 11:29:30 2020
InstallationDate: Installed on 2020-01-23 (12 days ago)
InstallationMedia: Ubuntu-Budgie 20.04 LTS "Focal Fossa" - Alpha amd64 (20200119)
InstalledPlugins:
 gnome-software-plugin-flatpak N/A
 gnome-software-plugin-snap 3.35.2-0ubuntu1
SourcePackage: gnome-software
UpgradeStatus: No upgrade log present (probably fresh install)

[Alistair (alistair-george)]

This is Synaptic showing updates whereas Software shows none: