Pause bug in an open to LAN world

Descrition:

When you create a world in this versions and you are trying to pause the game wou will notice that the pause would work, but as soon as you open to LAN that world and try to pause, the pause menu will show up, but the game will still run. For example, mobs are still movig, you can drown in you tried to pause the game in the ocean, and the time will still pass. Not even the Book an Quill will pause the game in an opened to LAN World.

*Pressing F3+Esc in a LAN World will shou the game pause menu instead of showing the text "Game paused" and it won't gonna pause the game

Expected Result:

All of the Entities (even the player) should freeze when pausing the game in a LAN world with "Esc" ; "F3 + Esc" or the book and quill. 

Actual Result:

Every mob are still movig, and the time still passes.

Reproduce Steps:

1. Create a world in these versions
2. Go to the options and press "Open to LAN"
3. Try to pause the game. You will notice that it won't gonna work.