QMediaObject never emits MetaDataAvailableChanged under linux gstreamer

Open (and start playing a song - using QMediaPlayer). Calling metaDataAvailable() returns false.

Listening for metaDataAvailableChanged - it is never emitted. However, both metaDataChanged(QString,QVariant) and metaDataChanged() are emitted multiple times, and furthermore once one of these has been emitted a call to metaDataAvailable() results in 'true'.

Note: I might be doing something wrong but it appears as though using QAudioDecoder instead of QMediaPlayer never triggers any of the metaData signals.