When I view the tags of an Ogg Vorbis file, the list always includes a
VENDOR tag even though the file doesn't have one. Is this intended
behaviour?

Home > Album Artists > Lankum > Cold Old Fire > The Tri​-​Coloured House > More Info > View Tags
ALBUM: Cold Old Fire
ARTIST: Lankum
TITLE: The Tri​-​Coloured House
TRACKNUMBER: 8
VENDOR:

$ vorbiscomment -l Lankum/Cold_Old_Fire/08_The_Tri​-​coloured_House.ogg
TITLE=The Tri​-​Coloured House
ARTIST=Lankum
ALBUM=Cold Old Fire
TRACKNUMBER=8
$