Hmm, I haven't dabbled with multiplayer in a while but I faintly remember that that's not supposed to happen actually. If a player is set as host specifically it should keep the game running regardless. Maybe I remember that wrong though...
This works in a weird way. The host keeps receiving some events (messages I believe), but it keeps the object synchronized in its position.
Anyway, as a better example just use Photon and nothing else works. The game is completely paused.
Even without considering multiplayer, some games that have "action wait" can make the player want to press alt+tab to do something else. It is very unpleasant not being able to disable this option.