I have the 1st year Kickr Bike and have been riding it on zwift since taking possession. Don’t have any issues. Running zwift on a wired PC with GPU. Bike is paired via ANT+. Bike’s tilt feature only works in free ride, ie, will not work in erg mode.
Take a look at this thread if you haven’t already:
https://forums.zwift.com/t/wahoo-kickr-bike-climb-doesnt-tilt-solved/495942