Zwift play makes Tacx Neo 2T controlled

I have Zwift play controllers and use ATV therefore now pairing trainer, HRM and ZP via companion app as bridge - if I connect the ZP controllers when I connect trainer at start of session before a ride the trainer is not controlled during the ride (despite connections screen showing it as controllable) however if I don’t connect ZP initially and start a ride the trainer is controlled and I can then add the ZP controllers during the ride and the trainer (Tacx Neo 2T) continues to be controlled. Am I doing something wrong or is this a bug?? Many thanks.