By default, a
RigidBody does not send a signal if it collides with another one
RigidBody, This is usually a good thing
RigidBodies can often collide and trigger many signals that do not interest you and affect performance.
If you do take care of the recognition
RigidBody You should stop collisions
RigidBody.contacts_reported to a value greater than
From the documents
If this is the case, the RigidBody sends out signals when it collides with another RigidBody.