The solution for providing more meaningful RPi4 audio output choice names given in post Set proper audio device names on Raspberry pi 4 - #21 by dbeach does not work after the update. The solution had lines such as these added to /etc/pulse/default.pa:
### Set meaningful output device descriptions for UI
update-sink-proplist alsa_output.platform-bcm2835_audio.stereo-fallback device.description='HDMI1'
update-sink-proplist alsa_output.platform-bcm2835_audio.stereo-fallback.2 device.description='HDMI2'
update-sink-proplist alsa_output.platform-bcm2835_audio.stereo-fallback.3 device.description='Headphone Jack'
Following the update, this set of errors is thrown for each of the update lines because the sink names have changed:
Jun 02 05:53:29 pi002.adbuco.com pulseaudio[654]: No sink found by this name or index.
Jun 02 05:53:29 pi002.adbuco.com pulseaudio[654]: Failed to initialize daemon due to errors while executing startup commands. Source of commands: /etc/pulse/default.pa
Jun 02 05:53:29 pi002.adbuco.com systemd[534]: Failed to start Sound Service.
Use pacmd list-sinks to find the new sink names that apply your kit and update /etc/pulse/default.pa something like this:
### Set meaningful output device descriptions for UI
update-sink-proplist alsa_output.platform-fef00700.hdmi.iec958-stereo.monitor device.description='HDMI1'
update-sink-proplist alsa_output.platform-fef05700.hdmi.iec958-stereo.monitor device.description='HDMI2'
update-sink-proplist alsa_output.platform-bcm2835_audio.stereo-fallback.monitor device.description='Headphone Jack'