Network sinks not discoverable if Avahi is using IPv6

Pulseaudio network sinks used to work couple of Ubuntu releases ago. Now they are broken in precise and i decided to figure out why. This is the reason:
https://bugs.freedesktop.org/show_bug.cgi?id=40785

Disabling ipv6 in avahi config works as a workaround, but this seems to be a bug in pulseaudio. Ipv6 is enabled by default.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: pulseaudio 1:1.1-0ubuntu15.1
ProcVersionSignature: Ubuntu 3.2.0-31.50-generic-pae 3.2.28
Uname: Linux 3.2.0-31-generic-pae i686
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu13
Architecture: i386
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: cosmo 6736 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfebf8000 irq 45'
   Mixer name : 'Analog Devices AD1988'
   Components : 'HDA:11d41988,104381e1,00100400'
   Controls : 49
   Simple ctrls : 26
CurrentDmesg:
 [ 47.572257] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
 [ 52.607607] init: plymouth-stop pre-start process (2101) terminated with status 1
 [ 58.256013] eth0: no IPv6 routers present
Date: Wed Sep 26 15:08:00 2012
ProcEnviron:
 LANGUAGE=en_US:en
 TERM=xterm
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: pulseaudio
UpgradeStatus: Upgraded to precise on 2012-05-15 (133 days ago)
UserAsoundrc: pcm.!default front:AudioPCI
dmi.bios.date: 10/26/2006
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0806
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: P5B
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0806:bd10/26/2006:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP5B:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer