I just checked and gsd has a copy-pasted version of the exact same source file that caused the problem in gvca.
Compare: gnome-volume-control/src/gvc-mixer-stream.c vs gnome-settings-daemon/plugins/media-keys/cut-n-paste/gvc-mixer-stream.c
They are the same file so I have opened a new upstream bug for gsd.
I just checked and gsd has a copy-pasted version of the exact same source file that caused the problem in gvca.
Compare: control/ src/gvc- mixer-stream. c daemon/ plugins/ media-keys/ cut-n-paste/ gvc-mixer- stream. c
gnome-volume-
vs
gnome-settings-
They are the same file so I have opened a new upstream bug for gsd.