A problem in which one collision cannot be triggered when applying two overlapping collisions


I let the statue break in a crash using fracture mode. And when the character overlaps with the box, physics is applied and it falls from above. So far, it works normally. But the small box I made, for lagdoll, doesn’t work. My intention is that the small box is overlapped behind the overlap of the big box (so that physics applies to give gravity), and eventually, if the character avoids it, it collides with the floor and breaks (which works normally now) or if it collides with the character. But lagdoll doesn’t happen. Is there a cause or better way to do it?