Does not display packages that can be updated

[Jarno Suni]

Still the dialog shows that some data will be downloaded, see the attached image.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: update-manager 1:20.04.10.1
ProcVersionSignature: Ubuntu 5.4.0-40.44-generic 5.4.44
Uname: Linux 5.4.0-40-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.20.11-0ubuntu27.3
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: XFCE
Date: Fri Aug 28 16:09:36 2020
DpkgHistoryLog.txt:
 Start-Date: 2020-08-28 16:08:57
 Commandline: apt install google-chrome-stable
 Requested-By: jarnos (1000)
 Upgrade: google-chrome-stable:amd64 (83.0.4103.116-1, 85.0.4183.83-1)
 End-Date: 2020-08-28 16:09:11
InstallationDate: Installed on 2020-05-03 (117 days ago)
InstallationMedia: Xubuntu Core 20.04 - amd64 - 20200423
PackageArchitecture: all
SourcePackage: update-manager
UpgradeStatus: No upgrade log present (probably fresh install)