If material has properties, you can attempt to drag-move objects under it

Add object. Animate property on it's default material to create a property row for material. Add another object. Drag the new object into the material row of the first object -> it's allowed (it shouldn't). The object doesn't seem to move, though, when you drop it under a material. However, when you change slide and back, the moved object has vanished. Undoing things doesn't appear to restore the vanished row, though again changing the slide and back will bring the vanished row back.