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no sound on ubuntu core on raspberry pi 4b

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I just installed default image from imager - ubuntu core 22 32bit, but the same problem is with ubuntu core 20 32bit - on Raspbery Pi 4b. I cannot get the sound working. It has the default config.txt with dtparam=audio=on and when I get asound cards I see both hdmi and headphones:

cat /proc/asound/cards
 0 [b1             ]: bcm2835_hdmi - bcm2835 HDMI 1
                      bcm2835 HDMI 1
 1 [Headphones     ]: bcm2835_headpho - bcm2835 Headphones
                      bcm2835 Headphones

and proper processes running:

/sbin/lsmod | grep snd_bcm283
snd_bcm2835            32768  0
snd_pcm               126976  4 snd_compress,snd_pcm_dmaengine,snd_bcm2835,snd_soc_core
snd                    90112  5 snd_compress,snd_timer,snd_bcm2835,snd_soc_core,snd_pcm

Unfortunately /etc/pulse/default.pa is missing and I don't gat audio-playback slot. Any ideas what I've missed?

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