Breakout room

Hi there!

I am trying to setup an environment for a partner that uses Zoom and Breakout Rooms (trainings for about 600 people).

There are a couple of questions I have:

1.  What happens to a pre-assigned user if he gets reconnected (internet failure, device change, whatever) - will he get in the same room he was assigned?

2. Users that could not be pre-assigned - they will have to be assigned manually to a room, but what happens upon a reconnect? They have to be assigned again? They will go to same room as they were? They will go to a random room?

3. For us it is mandatory that same rooms are kept upon disconnection, but also is impossible to assure such a high number of users respond in advance with their Zoom account. What would be best practice in such scenario?

Thank you in advance!