sound indicator renders incorrect when switching fast between indicators

Now that the target is a pixel perfect desktop I report this visual annoying bug that has accompanied us now for some release cycles.

When fast switching between indicators the sound indicator flickers and is rendered incorrect displaying a whit bar where the sound volume control should be.

See attachment ↓

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: indicator-sound 0.8.3.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-17.27-generic-pae 3.2.6
Uname: Linux 3.2.0-17-generic-pae i686
ApportVersion: 1.94-0ubuntu1
Architecture: i386
Date: Sat Mar 3 13:23:23 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta i386 (20120227)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: indicator-sound
UpgradeStatus: No upgrade log present (probably fresh install)