Shutting off webcams and mics in breakouts except for co-hosts

Some of the Zoom Meetings I run require them to be like webinars, participant listen only and chat.

When I login and set-up the program under Host Tools I disable all participant options except Chat.  I make all my presenters co-hosts so they can have the webcam, mic, and share features.  This works great in the main room but when everyone moves to a breakout the co-hosts still have their webcam, mic and share capabilities but it seems that the participants (at least some) can now turn their webcams and mics on. I thought the main settings for participants would also carry over to breakouts.  

Is this incorrect or am I doing something wrong?