software-center won't update package list automatically

1. Start Oneiric iso in KVM (eg using testdrive)
2. Run software-center and select Edit - Software Sources
3. In software sources dialog, enable universe sources, quit dialog by selecting "Close"
 - > Note: Software center won't update package list automatically
5. Select a universe package (eg 7zip)

Instead of updating the previously enabled universe package list automatically, software center offers the user to "Use this Source" (referring to universe source)

This is inconsistent behavior and might be confusing for the user, since they already activated the universe sources. Moreover, in previous Ubuntu releases (I am running Maverick), software-center used to automatically update package list when sources changed.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: software-center 5.0
ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
ApportVersion: 1.23-0ubuntu2
Architecture: amd64
CasperVersion: 1.284
Date: Fri Sep 30 16:25:54 2011
LiveMediaBuild: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110930)
PackageArchitecture: all
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: software-center
UpgradeStatus: No upgrade log present (probably fresh install)