guided partitoning for entire disk creates empty partitions

[Georg]

Platform: VirtualBox 4.0.12 r72916 on Ubuntu 10.04 2.6.38-11 generic
OS: [Kubuntu] oneiric-desktop-i386.iso (Beta 1 20110831)

Steps to reproduce:
1) Start machine with Live CD present
2) Select "Start Kubuntu"
3) Choose Swedish language
4) Select "Install Kubuntu"
5) Click "Forward" to get to the disk partition options
6) Select "Guided" and "Entire Disk"
7) Complete installation with default options
8) Wait for installation to complete
9) Open a terminal and enter "sudo sfdisk -l"

Expected Result:
- 3 partitions, 1 swap, 1 Linux and 1 extended

Actual Result
- 5 partitions, 1 swap, 1 Linux, 1 extended and 2 empty

Here is the result of my "sudo sfdisk -l" (Sorry it's in Swedish, but basically it lists sda3 and sda4 as empty ("Tom").

Disk /dev/sda: 1958 cylindrar, 255 huvuden, 63 sektorer/spår
Varning: utökad partition börjar inte på jämn cylindergräns.
DOS och Linux kommer att tolka innehållet annorlunda.
Enheter = cylindrar med 8225280 byte, block med 1024 byte, räknat från 0

   Enhet Start Början Slut Cyl. Block Id System
/dev/sda1 * 0+ 1827- 1828- 14680064 83 Linux
/dev/sda2 1827+ 1957- 131- 1045505 5 Utökad
/dev/sda3 0 - 0 0 0 Tom
/dev/sda4 0 - 0 0 0 Tom
/dev/sda5 1827+ 1957- 131- 1045504 82 Linux växling / Solaris

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: ubiquity (not installed)
ProcVersionSignature: Ubuntu 3.0.0-9.15-generic 3.0.3
Uname: Linux 3.0.0-9-generic i686
Architecture: i386
Date: Wed Aug 31 22:43:38 2011
InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Beta i386 (20110831)
ProcEnviron:
 LANGUAGE=
 LANG=sv_SE.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)