time zone map: graphical mismatch of selected city and highlighted time zone

During installation of today's lubuntu i386 build:

Clicking somewhere near the Russian cities Omsk and Novosibirsk (just in the middleof the country; also happens at other places) marks these cities by a red dot, but this red dot does not lie inside the automatically selected time zone highlighted in green color.

Expected: Red dot lies inside green time zone.

This might be another case of
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/334284
which was marked fixed a long time ago.

See also
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/838045 ,
but I don't think this has anything to do with it, just for reference...

Attaching a screenshot.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: ubiquity 2.10.16
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic i686
ApportVersion: 2.0.1-0ubuntu5
Architecture: i386
CasperVersion: 1.315
Date: Mon Apr 23 23:32:39 2012
InstallCmdLine: file=/cdrom/preseed/lubuntu.seed boot=casper only-ubiquity initrd=/casper/initrd.lz quiet splash -- debian-installer/language=de keyboard-configuration/layoutcode?=de
LiveMediaBuild: Lubuntu 12.04 "Precise Pangolin" - Release i386 (20120423)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)