The game sounds stop when you interact with any kind of overlays that are on top of the game itself such as Keyboard, notifications shade, app pop ups, notification pop ups and so on.

How to reproduce:

• Start the game.
• Enter a world (optional).
• When you're in the game try one of the following:
• - within the game try to pull down the notifications panel from the top of your screen.
• - within the game open the chat and start typing.

You'll notice that the game sounds get completely muted until you're back to the game itself (when you close down the notifications or close the keyboard in that case).

This has been affecting all game versions for years.