On earlier versions of Discourse, archive.org playlists used to display like this
now however, pasting in that same link results in this, where you can only play the first file through a generic audio player.
Not certain if this is a bug or just an unfortunate result of a larger change to how audio files are displayed, so I’ve just put it under the “ux” category to be safe.
Also, the previous version where they displayed correctly was 2.4.0.beta8 (was on a hosted solution)