The issue has been resolved. See the pulseaudio issue linked above.

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https://bugs.launchpad.net/bugs/1864253

Title:
  Pulseaudio sink/source selection, weird behaviour.

Status in PulseAudio:
  Unknown
Status in pulseaudio package in Ubuntu:
  New

Bug description:
  I have a Laptop connected to an USB-C dock. By default the docks analog
  audio output is chosen as the default pulse audio sink. I want that the
  analog output of the Laptop is the default, hence I configured this in
  /etc/pulse/default.py

  This does not work and journalctl informs me that the device chosen by me
  (alsa_output.pci-0000_00_1f.3.analog-stereo) does not exist, see attached 
output
  from journalctl.

  I have followed Workaround 1 here https://wiki.debian.org/BluetoothUser/a2dp
  to prevent pulseaudio getting started in gdm to prevent device capture.

  This does not work, the device does still not exist.
  Restarting pulseaudio sometimes, but not always sets the configured
  default sink. Furthermore plugging in the headphones in the Laptops analog 
input
  switches audio to the dock.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: pulseaudio 1:11.1-1ubuntu7.4
  ProcVersionSignature: Ubuntu 5.3.0-28.30~18.04.1-generic 5.3.13
  Uname: Linux 5.3.0-28-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.9
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  findus     3055 F.... pulseaudio
   /dev/snd/controlC1:  findus     3055 F.... pulseaudio
   /dev/snd/controlC0:  findus     3055 F.... pulseaudio
   /dev/snd/pcmC0D0p:   findus     3055 F...m pulseaudio
  CurrentDesktop: i3
  Date: Fri Feb 21 22:19:04 2020
  InstallationDate: Installed on 2019-06-13 (253 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 
(20190210)
  SourcePackage: pulseaudio
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/26/2019
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N2IET80W (1.58 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20N3S0UB00
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0R32862 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrN2IET80W(1.58):bd11/26/2019:svnLENOVO:pn20N3S0UB00:pvrThinkPadT490:rvnLENOVO:rn20N3S0UB00:rvrSDK0R32862WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad T490
  dmi.product.name: 20N3S0UB00
  dmi.product.sku: LENOVO_MT_20N3_BU_Think_FM_ThinkPad T490
  dmi.product.version: ThinkPad T490
  dmi.sys.vendor: LENOVO
  modified.conffile..etc.pulse.daemon.conf: [modified]
  modified.conffile..etc.pulse.default.pa: [modified]
  modified.conffile..etc.pulse.system.pa: [modified]
  mtime.conffile..etc.pulse.daemon.conf: 2020-02-21T20:38:20.081439
  mtime.conffile..etc.pulse.default.pa: 2020-02-21T19:27:57.386938
  mtime.conffile..etc.pulse.system.pa: 2020-02-21T15:23:09.470494

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