Can't play mp3s in a folder shared via an URL

[lu-x]

I get an error in the browser console:
HTTP-Content-Type "text/html" wird nicht unterstützt. Laden der Medienressource https://host.tld/index.php/apps/audios/getpublicaudiostreamsome%mp3%file.mp3?token=token12334 fehlgeschlagen.
Playback is working, if i'm logged in (not via URL).

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