Comment # 1 on bug 1070770 from Michael Andres

That's a bug. A '-' may be part of the name but it may also separate name and
version (e.g. kernel-default-4.4.79). 'gstreamer-plugin' may be intepreted as
(exact) name 'gstreamer' version 'plugin'. A match here obviously prevents
looking for (substring) name 'gstreamer-plugin'. We'll have a closer look at
it...