Music from music discs still plays when the game is paused

When you insert a music disc into a jukebox then immediately pause the game, the track can still sometimes play, even though the game is paused.

Steps to Reproduce:

1. Obtain a jukebox and any music disc.

2. Place the jukebox down.

3. Insert the disc into the jukebox and immediately pause the game.

4. Observe.

Observed Result:
Sometimes, the track can continue playing even when the game is paused.

Expected Result:
The track should always pause when the game is paused.

Note: the pause feature must be enabled and in a singleplayer world. And the texture packs do not affect this issue.