I think I’ve got this correct, unless the other object needs the collision, this doesn’t work as is, has a property, a cube to contact the other cube and the following bricks. This should load into another scene.
Both objects need collision bounds, in order to detect a collision.
If the property is correct(case sensitive, default property: Prop, it would use an uppercase P) on the other cube and the scene name is correct then it should work indeed.