Backpedaling

Hi, I've just bought a tacx neo 2t, and set it up. 

I've made a trial ride, but I discovered that I can't stop pedaling, or back pedaling as on a classic bike, because the cassette will keep rotating  bringing the chain with it and actually risking of knotting and breaking it. 

Is that how it should behave? It's weird.

Thanks for your answer. 

V

PS: the neo is plugged, but even unplugged behaves the same