I'm just trying to do a very simple cloth tear in C4D. I've tried a few times and keep getting the same issue. The plane distorts as if it's going to tear but it doesn't, the vertices stay attached and just stretch instead.
From the help file: "With this option enabled the cloth engine will allow for tearing to take place during the simulation. But in order for this tearing to work, the cloth object must be a child of the Cloth object. In other words, the Cloth object is the actual surface that will be torn, not the original cloth object."