"If your snap currently plugs: [ pulseaudio ], you may want to opt into future-proofing and adjust it to use plugs: [ audio-playback, pulseaudio ] (adding audio-record as desired). Again, this is not required for existing snaps since they will be grandfathered into auto-connection."
https://forum.snapcraft.io/t/upcoming-pulseaudio-interface-deprecation/13418
"If your snap currently plugs: [ pulseaudio ], you may want to opt into future-proofing and adjust it to use plugs: [ audio-playback, pulseaudio ] (adding audio-record as desired). Again, this is not required for existing snaps since they will be grandfathered into auto-connection."