The style guild for unknown/untitled tracks says:

> For tracks that do not contain songs and that are not named by the artist, you can enter a descriptive name between brackets in all lowercase, or [untitled]. If the track contains only silence, use [silence].

Following this guide the first and last tracks of https://musicbrainz.org/release-group/6f9daefe-0060-3e58-af59-898ffb3b43a6 have been named with description of what the track is between []. The guideline says that the text between the brackets should be all lowercase, but the Guess Case tool capitalizes the words.