Per application volume controls are seemingly misremembered

I am running PipeWire 0.3.11 on Arch, and using the substitution packages pipewire-dropin and my own variant, lib32-pipewire-dropin. It seems that at unknown times, application volumes are misremembered, sometimes causing things like full volume or uneven stereo balance. This result must be manually corrected by touching the volume controls in pavucontrol.