As long as each track has been correctly logged in the first place, this metadata is retained even when mixed into an Anthems 'chunk' or as part of a fully pre-rec show. The dira! playout system links to the 'Now Playing' info.
Basically, if done correctly, music is logged and marked on the system as 'send to public display' so it appears on Now Playing, but beds, imaging, trails, speech clips etc are not marked 'send to public display' so they don't appear on Now Playing, even though everything is played out of the same system. This also generates the tracklistings on programme web pages - if these are ever blank it's because there was some kind of error with the music logging.