xvimagesink fails on a specific webm file

Submitted by ale

Created attachment 370522
the file that fails

as reported on irc, the attached file fails to run as

gst-launch-1.0 -v filesrc location=/tmp/01.webm ! matroskademux ! vp9dec ! videoconvert ! videoscale ! autovideosink

but runs as

gst-launch-1.0 playbin uri=file:///tmp/01.webm

Attachment 370522, "the file that fails":
01