I have seen or rather heard this problem in both Creative and Survival. The in game music tracks begin playing while one is already playing. I have to pause the game to stop the music entirely. I like the in game music and prefer to keep it turned up where I can hear it, but the double tracks is very distracting and annoying. 😞
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This also happens when you are listening to a music disc using a jukebox. Normal background music starts playing while a music disc is already playing.
(Environment: Windows 7)