When the following sequence of events occurs while entering a track:

1. Track name - Art (pause typing)
<track parser runs>
1. Track name - Artist (pause typing)
<track parser runs>
1. Track name - Artist name (pause typing)
<track parser runs>

Each run of the track parser considers the artist name typed up until that point to be finished, and will thus add a new artist as an artist collaboration, combined with automatically generated join phrases you end up with this horrible result:

1. Track name - Art, ist & name