What's new : I can reproduce the problem on Ubuntu 20.04 live USB, so
I'm sure the root cause is not a broken config on my side.

To summarize :

Ubuntu 20.04 / Fedora 32.1 are affected. (Ubuntu 19.10 is not)

- Rhythmbox 3.4.4 fully affected (wrong sink at start + output is switched to a 
RAOP sink with each new song)
- Spotify is mildly affected : wrong sink at start, but after that you can play 
new song normally
- Rhytmbox 3.4.3 (in Ubuntu 19.10) is lightly affected : wrong sink on 1st 
launched, but the last sink used is saved for next launch
- VLC, Totem, Firefox, Chromium are unaffected
 

Requirements to trigger the bug : 1 (maybe 2) RAOP (aka Airplay /
AirTunes) sinks available on local network in addition to local
soundcard.

Steps to reproduce :
$ sudo apt install pulseaudio-module-raop
$ sudo apt install paprefs
If needed, fix paprefs (which is broken in 20.04)
$ sudo ln -s /usr/lib/pulse-13.99.1/ /usr/lib/pulse-13.99
optional, to monitor sinks used by rhythmbox :
$ sudo apt install pavucontrol && pavucontrol
Launch paprefs and check "Make discoverable Apple AirTunes soud devices 
available locally"
Launch Rhythmbox, play a track, correct the sink, play another track (next 
button or direct choice), correct the sink, etc.

As the issue has been abruptly dismissed upstream :
https://gitlab.gnome.org/GNOME/rhythmbox/-/issues/1797#note_844963 (I
assume the guy knows his job), you are my only hope here !


I know it's my fault, I should have stayed in Ubuntu 19.10 and wait 20.04.1, 
but I felt harassed by the updater popup reminder :) No, seriously I needed 
rhythmbox 3.4.4, to support my new phone.

So what should I do now ? I understand there is some kind of middleware
between pulseaudio and rhythmbox : gstreamer ? Could it be the "culprit"
? If yes, should I report a bug here
https://gstreamer.freedesktop.org/bugs/ or downstream ? Is it possible
to downgrade gstreamer ?


** Bug watch added: gitlab.gnome.org/GNOME/rhythmbox/-/issues #1797
   https://gitlab.gnome.org/GNOME/rhythmbox/-/issues/1797

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https://bugs.launchpad.net/bugs/1883902

Title:
  rhythmbox ignores pulseaudio default sink and outputs sound on random
  device

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