Comment 5 for bug 1948882

I found the root issue and a workaround. Pulseeffects package in Impish is of the same version as in Hirsute 4.8.4-1, so it cannot be the direct cause. But the issue is eliminated by downgrading the following four packages from their Impish version 0.40.0-1 to the Hirsute version 0.38.0-2:

dconf-gsettings-backend dconf-service dconf-cli libdconf1

So it seems that either newer DConf has a bug or PulseEffects should be updated to handle some interface changes in DConf.