System Sound Events Not Playing even when enabled

Expected Behavior:

Doing something like displaying a warning or error should play an error sound.

Actual Behavior:

Some events don't play sounds at all when they should, even though the event-sounds setting is enabled through dconf or Tweaks. The other Yaru system sounds are present in /usr/share/sounds/Yaru yet nothing still plays. Some sounds that do play is the warning that appears when closing multiple tabs in firefox, and inserting a usb device

To reproduce:

Do something that should produce an error or warning noise, like emptying the trash or quitting terminal with a running process open.

The sound theme is installed from apt repository, yaru-theme-sound version 18.10.6

I'm not 100% certain this package is the culprit, but here's the info:
libcanberra version: 0.30-6ubuntu1
Ubuntu version 18.10

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: libcanberra0 0.30-6ubuntu1
ProcVersionSignature: Ubuntu 4.18.0-11.12-generic 4.18.12
Uname: Linux 4.18.0-11-generic x86_64
ApportVersion: 2.20.10-0ubuntu13.1
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Nov 27 16:49:51 2018
InstallationDate: Installed on 2018-11-25 (2 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: libcanberra
UpgradeStatus: No upgrade log present (probably fresh install)