Why the rigid body constraint empty doesn't go with the parent when rigid body simulation is played? (Pls Help.)

Hello guys. Is this a new way of dealing with rigid body constraints? In older tutorials I have seen users parent the empty to the main moving body and when simulation is played the empty goes along with the parent.

Currently in blender when I parent an empty to the main moving body, the empty will stay still and not go with the parent. Is this a bug or just a new implementation?

Thanks.