Zoom breakout room hosts

I assigned breakout rooms for our weekly team meeting. I assigned a co-host in the case I wasn't able to start the meeting. Since he was not part of any of the breakout rooms he left the meeting. Once he dropped off the call, it ended the breakout rooms for everyone, even though I was still on the call. Do I just need to remove any co-hosts? Do I have to keep the meeting going to keep the breakrooms open?