Collision Lost due to clone deletion

Create a cube in Constructor, then make clones of it manually or with the 'Duplicate' helpers. Delete only the original cube that the other cubes were cloned from, and then export and load into Torque. The collisions do not work. Restarting Constructor isn't necessary to fix this, just undo the deletion of the main cube, re-export, and the collisions come back. Are the cloned objects necessarily dependent on the original?