I recently bought Minecraft on my iPhone 13 Pro. It's the latest version on the App Store as of writing this, version 1.21.51. The sound worked when I launched the app for the first time, but it stopped working when launching the app again. When it launches, it sometimes works, and sometimes it doesn't. Most of the time, it doesn't work though. It seems to be something that is decided when the app launches. I don't hear any sounds at all, including sound effects and music. I checked to make sure that my phone's mute switch is not set to the silent position, as most people on the internet suggest. I also tried resetting the sound settings in the game.