When the game is launched everything loads normally. But you quickly notice that no music is playing and when tapping buttons no sounds emit from them. This does not make the game unplayable.

i seem to find a way to recover sounds:
1. Open Minecraft and wait for everything to load as normal.

2. Exit Minecraft but do not close the game from the app switcher (do not force close it).

3. Open Minecraft again and you will hear a button sound and music will start playing. By then all sound is restored.

Note: these steps have to be done every time you launch the game.