The bug works in the "Nether Wastes" level, where at the beginning of the level there is a door that you have to enter to continue with the level, but when passing through the door, the background music changes to a set of ambient sounds (the same as the Gold Room).

This did not happen before since when passing through that door in previous versions, the music did not change and the song was still playing, known on Spotify as: "Nether Wastes" from the music album Minecraft Dungeons: Flames of the Nether.