Difficulty changes made while the game is paused take effect immediately

While the game is paused, changing the difficulty from non-peaceful to peaceful then changing it back still makes all hostile mobs disappear.

Steps to reproduce:

1. Enable “Enable Pause Game” in General settings.

2. Enter a singleplayer world and summon some hostile mobs.

3. Pause the game.

4. Change the difficulty to peaceful, then change it back.

5. Unpause the game.

Expected result:

Adjustments made while the game is paused should not take effect. Settings changes should only apply the second you unpause the game.

Actual result:

Even if you change it back before unpausing the game, the changes still take effect, making accidental misclicks unrecoverable.