Apparently the one in my home directory takes precedence over the system-wide ones.
Torbjörn Andersson
I may already have strayed from the topic of this bug report (sorry
about that), but it looks like I was able to solve my problem by making
~/.local/share/dbus-1/services/org.xfce.xfce4-notifyd.Notifications.service
a symlink to
/usr/share/dbus-1/services/org.xfce.xfce4-notifyd.Notifications.service
