I confirm that osspd-pulseaudio_1.3.2-12.2_amd64.deb and osspd_1.3.2-12.2_amd64.deb from Debian Sid fixed the issue on Ubuntu Mate 20.04.
I confirm that osspd-pulseaudi o_1.3.2- 12.2_amd64. deb and osspd_1. 3.2-12. 2_amd64. deb from Debian Sid fixed the issue on Ubuntu Mate 20.04.