Every time when I change sound device configuration (plug in or plug out bluetooth headset, change headset mode from audio to headset itself) sound is muted. It's easy to restore sound level, but sometimes after boot pulseaudio is just not recognizes builtin analog stereo or can not add headset mode with microphone to headset. In such cases I have to run this shell script:
#!/bin/sh
rm -rf .config/pulse/*
killall pulseaudio
Maybe, someone else is facing similar problems, so this can help. Problem is existing in Neon since last year, but still not fixed:(

Can you run the following to edit the service

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systemctl edit --full --user pulseaudio.service

and change the ExecStart line to read

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ExecStart=/usr/bin/pulseaudio --daemonize=no --log-target=journal -v --log-level=debug

then try to get the stereo inputs to not get recognized and grab a log for pasting here

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journalctl --user -b -1 _SYSTEMD_USER_UNIT=pulseaudio.service

Ok, will try this on next problem occurrence

ноя 14 20:26:45 chikatori-G3-3779 pulseaudio[3155]: Failed to open cookie file '/home/chikatori/.config/pulse/cookie': Нет такого файла или каталога
ноя 14 20:26:45 chikatori-G3-3779 pulseaudio[3155]: Failed to load authentication key '/home/chikatori/.config/pulse/cookie': Нет такого файла или каталога
ноя 15 12:34:02 chikatori-G3-3779 pulseaudio[3155]: ALSA сообщила о возможности записи новых данных в устройство, но на самом
ноя 15 12:34:02 chikatori-G3-3779 pulseaudio[3155]: деле писать было нечего. Скорее всего, это ошибка в драйвере ALSA «snd_hda_intel».
ноя 15 12:34:02 chikatori-G3-3779 pulseaudio[3155]: Пожалуйста, сообщите об этой проблеме разработчикам ALSA. Процесс разбужен
ноя 15 12:34:02 chikatori-G3-3779 pulseaudio[3155]: с установленным POLLOUT, однако последующий вызов snd_pcm_avail() вернул 0
ноя 15 12:34:02 chikatori-G3-3779 pulseaudio[3155]: или другое значение, меньшее чем min_avail.
ноя 15 12:39:07 chikatori-G3-3779 pulseaudio[3155]: After module unload, module 'module-null-sink' was still loaded!

Translated to english via google:
Nov 14 20:26:45 chikatori-G3-3779 pulseaudio [3155]: Failed to open cookie file '/home/chikatori/.config/pulse/cookie': No such file or directory
Nov 14 20:26:45 chikatori-G3-3779 pulseaudio [3155]: Failed to load authentication key '/home/chikatori/.config/pulse/cookie': No such file or directory
Nov 15 12:34:02 chikatori-G3-3779 pulseaudio [3155]: ALSA reported the possibility of writing new data to the device, but in fact
Nov 15 12:34:02 chikatori-G3-3779 pulseaudio [3155]: there was nothing to write about. This is most likely a bug in the "snd_hda_intel" ALSA driver.
Nov 15 12:34:02 chikatori-G3-3779 pulseaudio [3155]: Please report this issue to the ALSA developers. Process is awakened
Nov 15 12:34:02 chikatori-G3-3779 pulseaudio [3155]: with POLLOUT set, but subsequent call to snd_pcm_avail () returned 0
Nov 15 12:34:02 chikatori-G3-3779 pulseaudio [3155]: or other value less than min_avail.
Nov 15 12:39:07 pm chikatori-G3-3779 pulseaudio [3155]: After module unload, module 'module-null-sink' was still loaded!

Looks like problem is gone after creating ~/.config/pulse/cookie by hand. WIll observe this for next configuration change case

Not sure about "losted" devices, but muting after configuration change is still exists