I was in the end, exploring some of the new islands adjacent to the first end gateway island with my first end city on it, while wearing headphones chatting to a friend. I noticed during this that the music bugs frequently, stuttering and getting stuck that way. It sounds like a badly-scratched CD skipping endlessly. Eventually it goes back to normal but will go back into super-stutter mode frequently.

In the overworld, I noticed that the music drops out entirely. As someone who's always played with the music on, MC is an entirely different game if there's no background music.