Calibration icon just appearing with Bluetooth connection?

Hi there,

I’ve been riding on zwift using my Elite Direto XR and I always did the internal calibration on Zwift using the wrench icon on the pairing screen. I now switched from Bluetooth to ANT+ and no matter which ANT+ protocols I connect to, the wrench icon is gone. As soon as I connect via Bluetooth, it reappears again.

Is it normal the Direto can just be calibrated using the Bluetooth connection?