You can have the teleporter only enabled during game phase so it doesn’t turn on until after the game starts, so it doesn’t interfere with pregame,
tie the teleporter to the lobby spawnpads on player spawned and once the teleporters turn on at game start the spawnpads will teleport player into game,
I’m not sure if teleporters have a delay, but I’m not sure how to give them a bit of time in lobby before jumping into it.
A teleporter inside the lobby with a barrier that disables on game start is another option.