I get the same issue as above.
Happens on all emulators after using pause screen and then later exiting the game either via pause or esc button the background music has stopped. Navigation sounds are still working. I can manually get background music playing again via keyboard mapping keys for start background music / next track.
I have background music sound settings to priorities over video sound. I note that if I just use video sound and not background music the video sound is not affected by the pause screens.