Disabled Games | If you're running a server below 1.13 which allows newer clients to join they'll still see all games in the menu but won't be able to start them. The disabledGame message is sent instead. This goes for both singleplayer and multiplayer. This will allow players to realize that the game exists and can change their client if they wish to play it.
Held Slot | Pocket Games sets the held item slot to the first empty slot to avoid the item jumping in the player's hand. Pocket Games will now remember the slot the player had selected prior to opening the menu and then reselect it once they close Pocket Games again.