Ghast Sounds Can be Heard in Peaceful

Verification builds:
1.2.2.3

Summary:
When travelling through the nether after changing the difficulty to Peaceful, Ghast sounds continue to play.

Repro Steps:

1. Travel through a section of the nether in Hard difficulty

2. Change the difficulty to Peaceful

3. Now travel back to the original point

4. Observed Results:

5. Ghast sounds can still be heard, presumably as they exist for a split second before despawning.

Expected Results:
If the game is set to peaceful, no hostile mobs should be heard.

Screenshots/Videos attached: No

Notes: