I went and tried to play the new Nether music,but when I went there it was total silence, I then realised that it's because the old vanilla_music folder didn't update, I tried to go to the marketplace but it kept crashing the game, one simple fix is to update the music track on the marketplace.
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Thank you for your report!
We're actually already tracking this issue at MCPE-69271, so I will resolve and link this ticket as a duplicate.
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