Sound > Output Device selection reverts to default after resuming from sleepng from

My Dell XPS 13 is connected to a Lenovo Thinkpad docking station.

By default the audio output is selected as the audio out from the docking station.

I manually select the output device to be the XPS speakers.

After going into standby/suspend mode the audio output reverts to the docking station audio out.

Expected behaviour: The selected audio output device settings would be persistent across standby/suspend.

Potentially this may be expected to be persistent across power off/on or disconnect/reconnect as other settings (eg number of displays, order and orientation) are maintained.

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: gnome-control-center 1:3.38.5-1ubuntu2
ProcVersionSignature: Ubuntu 5.11.0-37.41-generic 5.11.22
Uname: Linux 5.11.0-37-generic x86_64
ApportVersion: 2.20.11-0ubuntu65.3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Mon Oct 18 20:58:55 2021
ExecutablePath: /usr/bin/gnome-control-center
InstallationDate: Installed on 2021-06-19 (121 days ago)
InstallationMedia: Ubuntu 21.04 "Hirsute Hippo" - Release amd64 (20210420)
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-control-center
UpgradeStatus: No upgrade log present (probably fresh install)