Jukebox.setPlaying( <material> ) does not start any music. No errors produced in the console. Tested with Jukebox.getPlaying() and it shows the jukebox is holding a (record) material. This code worked in 1.13.x

// Example: record type was shown in console but no music played.
Material record = jukeBox.getPlaying();
log.info("Record: " + record);
if (record != null && record != Material.AIR) jukeBox.setPlaying(record);